U.S. state
Also known as	Commonwealth (KY, MA, PA, VA)
Category	Federated state
Location	United States of America
Number	50
Government	State government

A U.S. state is a federated state of the United States of America that shares sovereignty with the United States federal government. Since the admission of Hawaii as a state in August 1959, there are fifty U.S. states. Because of the shared sovereignty between a U.S. state and the U.S. federal government, an American is a citizen of both the federal entity and of his or her state of domicile.^[1] Kentucky, Massachusetts, Pennsylvania, and Virginia use the official title of Commonwealth rather than State. State citizenship is flexible and no government approval is required to move between states, with the exception of paroled convicts.

The United States Constitution allocates certain powers to the federal government. It also places some limitations on the state governments. State governments are allocated power by the people (of each respective state) through their individual constitutions. By ratifying the United States Constitution, the people transferred certain limited sovereign powers to the federal government from their states. Under the Tenth Amendment, all powers not delegated to the federal government nor prohibited to the states are retained by the states or the people. Historically, the tasks of public safety (in the sense of controlling crime), public education, public health, transportation, and infrastructure have generally been considered primarily state responsibilities, although all of these now have significant federal funding and regulation as well (based largely upon the Commerce Clause, the Taxing and Spending Clause, and the Necessary and Proper Clause of the Constitution).

Over time, the Constitution has been amended, and the interpretation and application of its provisions have changed. The general tendency has been toward centralization and incorporation, with the federal government playing a much larger role than it once did. There is a continuing debate over states' rights, which concerns the extent and nature of the states' powers and sovereignty in relation to the federal government as well as the rights of individual persons. Debates over states' rights were a contributing factor in the outbreak of the American Civil War.

Congress may admit new states on an equal footing with existing ones; this last happened in 1959 with the admission of Alaska and Hawaii. The Constitution is silent on the question of whether states have the power to leave unilaterally, or secede from, the Union, but the Supreme Court has ruled^[2][3] secession to be unconstitutional, a position driven in part by the outcome of the American Civil War.

Map[link]

List of states[link]

Alabama  Alaska  Arizona  Arkansas  California  Colorado  Connecticut  Delaware  Florida Georgia

Hawaii  Idaho  Illinois  Indiana  Iowa  Kansas  Kentucky  Louisiana  Maine  Maryland

Massachusetts  Michigan  Minnesota  Mississippi  Missouri  Montana  Nebraska  Nevada  New Hampshire  New Jersey

New Mexico  New York  North Carolina  North Dakota  Ohio  Oklahoma  Oregon  Pennsylvania  Rhode Island  South Carolina

South Dakota  Tennessee  Texas  Utah  Vermont  Virginia  Washington  West Virginia  Wisconsin  Wyoming

Federal power[link]

The Supreme Court of the United States has interpreted the Commerce Clause of the Constitution of the United States which has expanded the scope of federal power. The Cambridge Economic History of the United States says, "On the whole, especially after the mid-1880s, the Court construed the Commerce Clause in favor of increased federal power."^[4] In Wickard v. Filburn 317 U.S. 111 (1942), the court expanded federal power to regulate the economy by holding that federal authority under the commerce clause extends to activities which are local in character.^[5] For example, Congress can regulate railway traffic across state lines, but it may also regulate rail traffic solely within a state, based on the theory that wholly intrastate traffic can still have an impact on interstate commerce. In recent years, the Court has tried to place limits on the Commerce Clause in such cases as United States v. Lopez and United States v. Morrison.^{[clarification needed]}

Another source of Congressional power is its spending power—the ability of Congress to impose uniform^{[clarification needed][citation needed]} taxes across the nation and then distribute the resulting revenue back to the states (subject to conditions set by Congress). A classic example of this is the system of federal-aid highways, which includes the Interstate Highway System. The system is mandated and largely funded by the federal government, and also serves the interests of the states. By threatening to withhold federal highway funds, Congress has been able to pressure state legislatures to pass a variety of laws. Although some object that this infringes on states' rights, the Supreme Court upheld the practice as a permissible use of the Constitution's Spending Clause in South Dakota v. Dole 483 U.S. 203 (1987).

Governments[link]

States are free to organize their individual governments any way they like, so long as they conform to the sole requirement of the U.S. Constitution that they have "a Republican Form of Government," that is, each state government must be a republic.

Constitutions[link]

In practice, each state has adopted a three-branch system of government (with legislative, executive, and judiciary branches) generally along the same lines as that of the federal government — though this is not a requirement.

Despite the fact that every state has chosen to follow the federal model of government, there are significant differences in some states.

There are also significant similarities. For example, all 50 states allow tax exemptions for religious institutions.^[6]

Executive[link]

In all of the U.S. states, the chief executive is called the Governor. The governor may approve or veto bills passed by the state legislature. In forty-four states, governors have line item veto power.

Most states have a "plural executive" in which two or more members of the executive branch are elected directly by the people. Such additional elected officials serve as members of the executive branch, but are not beholden to the governor and the governor cannot dismiss them. For example, the attorney general is elected, rather than appointed, in 43 of the 50 U.S. states.

Legislative[link]

The legislatures of 49 of the 50 states are made up of two chambers: a lower house (termed the House of Representatives, State Assembly or House of Delegates) and a smaller upper house, always termed the Senate. The exception is the unicameral Nebraska Legislature, which is composed of only a single chamber.

Most states have part-time legislatures, while six of the most populated states have full-time legislatures. However, several states with high population have short legislative sessions, including Texas and Florida.^[7]

In Baker v. Carr (1962) and Reynolds v. Sims (1964), the U.S. Supreme Court held that all states are required to elect their legislatures in such a way as to afford each citizen the same degree of representation (the one person, one vote standard). In practice, most states choose to elect legislators from single-member districts, each of which has approximately the same population. Some states, such as Maryland and Vermont, divide the state into single- and multi-member districts, in which case multi-member districts must have proportionately larger populations, e.g., a district electing two representatives must have approximately twice the population of a district electing just one.

If the governor vetoes legislation, all legislatures may override it, usually, but not always, requiring a two-thirds majority.

Judicial[link]

States can also organize their judicial systems differently from the federal judiciary, as long as they protect the federal constitutional right of their citizens to procedural due process. Most have a trial level court, generally called a District Court or Superior Court, a first-level appellate court, generally called a Court of Appeal (or Appeals), and a Supreme Court. However, Oklahoma and Texas have separate highest courts for criminal appeals. New York state has its own terminology, in that the trial court is called the Supreme Court. Appeals are then taken to the Supreme Court, Appellate Division, and from there to the Court of Appeals.

Most states base their legal system on English common law (with substantial indigenous changes and incorporation of certain civil law innovations), with the notable exception of Louisiana, a former French colony, which draws large parts of its legal system from French civil law.

Only a few states choose to have the judges on the state's courts serve for life terms. In most of the states the judges, including the justices of the highest court in the state, are either elected or appointed for terms of a limited number of years, such as five years, eligible for re-election or reappointment if their performance is judged to be satisfactory.

Relationships[link]

Under Article Four of the United States Constitution, which outlines the relationship between the states, the United States Congress has the power to admit new states to the Union. The states are required to give full faith and credit to the acts of each other's legislatures and courts, which is generally held to include the recognition of legal contracts, marriages, and criminal judgments, and before 1865, slavery status. States are prohibited from discriminating against citizens of other states with respect to their basic rights, under the Privileges and Immunities Clause. The states are guaranteed military and civil defense by the federal government, which is also required to ensure that the government of each state remains a republic.

Four states use the official name of Commonwealth, rather than State.^[8] However, this is merely a paper distinction, and the U.S. Constitution uniformly refers to all of these subnational jurisdictions as "States" (Article One, Section 2, Clause 1 of the Constitution, concerning the U.S. House of Representatives, in which Representatives are to be elected by the people of the "States"; Article One, Section 3, Clause 1, concerning the U.S. Senate, allocates to each "State" two Senators). For all of these purposes, each of the four above-mentioned "Commonwealths" counts as a State.

Admission into the union[link]

U.S. states by date of statehood

  1776–1790

  1791–1799

  1800–1819

  1820–1839

  1840–1859

  1860–1879

  1880–1899

  1900–1950

  1959

The order in which the original 13 states ratified the constitution, then the order in which the others were admitted to the union. (Click to see animation)

Since the establishment of the United States in 1776, the number of states has expanded from the original 13 to 50. The U.S. Constitution is rather laconic on the process by which new states could be added, noting only that "New States may be admitted by the Congress into this Union" and forbidding a new state to be created out of the territory of an existing state, or the merging of two or more states into one, without the consent of both Congress and all the state legislatures involved.

In practice, most of the states admitted to the union after the original 13 have been formed from Territories of the United States (that is, land under the sovereignty of the federal government but not part of any state) that were organized (given a measure of self-rule by the Congress subject to the Congress’ plenary powers under the territorial clause of Article IV, sec. 3, of the U.S. Constitution).^[9]

Generally speaking, the organized government of a territory made known the sentiment of its population in favor of statehood. Congress then directed that government to organize a constitutional convention to write a state constitution. Upon acceptance of that Constitution, Congress has always admitted that territory as a state. The broad outlines in this process were established by the Northwest Ordinance (1787), which predated the ratification of the Constitution.

However, Congress has ultimate authority over the admission of new states, and is not bound to follow this procedure. A few U.S. states (outside of the original 13) that were never organized territories of the federal government have been admitted:

• Vermont, an unrecognized but de facto independent republic until its admission in 1791^[10]
• Kentucky, a part of Virginia until its admission in 1792^[10]
• Maine, a part of Massachusetts until its admission in 1820^[10] following the Missouri Compromise
• Texas, a recognized independent republic until its admission in 1845^[10]
• California, created as a state (as part of the Compromise of 1850) out of the unorganized territory of the Mexican Cession in 1850 without ever having been a separate organized territory itself^[10]
• West Virginia, created from areas of western Virginia that rejoined the union in 1863, after the 1861 secession of Virginia to the Confederate States of America during the American Civil War^[10]

Congress is also under no obligation to admit states even in those areas whose population expresses a desire for statehood. For instance, the Republic of Texas requested annexation to the United States in 1837, but fears about the conflict with Mexico that would result delayed admission for nine years.^[11]

Once established, most state borders have been generally stable, with exceptions including the formation of the Northwest Territory in 1787 and the Southwest Territory in 1790 from various portions of the original states, the cession by Maryland and Virginia of land to create the District of Columbia in 1791 (Virginia's portion was returned in 1847), and the creation of states from other states, including the creation of Kentucky and West Virginia from Virginia, and Maine from Massachusetts. However, there have been numerous minor adjustments to state boundaries over the years due to improved surveys, resolution of ambiguous or disputed boundary definitions, or minor mutually agreed boundary adjustments for administrative convenience or other purposes.^[10]

Possible new states[link]

Today, there are several U.S. territories left that might potentially become new states.

Puerto Rico[link]

The most likely candidate for statehood is generally thought to be Puerto Rico. Puerto Rico called itself the "Commonwealth of Puerto Rico" in the English version of its constitution, and as "Estado Libre Asociado" (literally, Associated Free State) in the Spanish version. The island’s ultimate status has not been determined as of 2011^[update]. A plebiscite will be held on November 6, 2012 to determine the future of the Island.

As with any non-state territory of the United States, its residents do not have voting representation in the federal government. Puerto Rico has limited representation in the U.S. Congress in the form of a Resident Commissioner, a nonvoting delegate.^[12]

History[link]

Puerto Rico has been under U.S. sovereignty for over a century. Puerto Ricans have been U.S. citizens since 1917.

The U.S. Congress directed the Puerto Rican government to organize a constitutional convention to write the Puerto Rico Constitution in 1951. Like the U.S. States, Puerto Rico has a republican form of government organized pursuant to a constitution adopted by its people and a bill of rights. The Approval of that constitution by Puerto Rico's electorate, the U.S. Congress, and the U.S. President occurred in 1952. The rights, privileges and immunities attendant to the United States Citizens are "respected in Puerto Rico to the same extent as though Puerto Rico were a state of the union" through the express extension by the U.S. Congress in 1948 of the Privileges and Immunities Clause of the U.S. Constitution.^[13]

President George H. W. Bush issued a memorandum on November 30, 1992 to heads of executive departments and agencies establishing the current administrative relationship between the federal government and the Commonwealth of Puerto Rico. This memorandum directs all federal departments, agencies, and officials to treat Puerto Rico administratively as if it were a state, insofar as doing so would not disrupt federal programs or operations.^[14]

The commonwealth's government has organized several referenda on the question of status over the past several decades, though Congress has not recognized these as binding; all shown resulted in narrow victories for the status quo over statehood. On December 23, 2000, President Bill Clinton signed executive Order 13183, which established the President's Task Force on Puerto Rico's Status and the rules for its membership. Section 4 of executive Order 13183 (as amended by executive Order 13319) directs the task force to "report on its actions to the President ... on progress made in the determination of Puerto Rico’s ultimate status."^[15]

President George W. Bush signed an additional amendment to Executive Order 13183 on December 3, 2003, which established the current co-chairs and instructed the task force to issue reports as needed, but no less than once every two years. In December 2005, the presidential task force proposed a new set of referendums on the issue; if Congress votes in line with the task force's recommendation, it would pave the way for the first congressionally mandated votes on status in the island, and (potentially) statehood by 2012. The task force's December 2007 status report reiterated and confirmed the proposals made in 2005.^[15][16][17]

President Barack Obama appointed a new Task Force on Puerto Rico's Status.^[18] In March 2011, it recommended that all relevant parties—the President, Congress, and the leadership and people of Puerto Rico—work to ensure that Puerto Ricans are able to express their will about status options and have that will acted upon by the end of 2012 or soon thereafter.^[19] The report further recommends, "... if efforts on the Island do not provide a clear result in the short term, the President should support, and Congress should enact, self-executing legislation that specifies in advance for the people of Puerto Rico a set of acceptable status options, including the Statehood, that the United States is politically committed to fulfilling. This legislation should commit the United States to honor the choice of the people of Puerto Rico (provided it is one of the status options specified in the legislation) and should specify the means by which such a choice would be made. The Task Force recommends that, by the end of 2012, the Administration develop, draft, and work with Congress to enact the proposed legislation."^[19]

Washington, D.C.[link]

The intention of the Founding Fathers was that the United States capital should be at a neutral site, not giving favor to any existing state; as a result, the District of Columbia was created in 1800 to serve as the seat of government. The inhabitants of the District do not have full representation in Congress or a sovereign elected government (they were allotted presidential electors by the 23rd amendment, and have a non-voting delegate in Congress). Some residents of the District support statehood of some form for that jurisdiction—either statehood for the whole district or for the inhabited part, with the remainder remaining under federal jurisdiction. While statehood is always a live political question in the District, the prospects for any movement in that direction in the immediate future seem dim.

According to Article IV, Section 3 of the U.S. Constitution, "New states may be admitted by the Congress into this union; but no new states shall be formed or erected within the jurisdiction of any other state; nor any state be formed by the junction of two or more states, or parts of states, without the consent of the legislatures of the states concerned as well as of the Congress."^[20] This was the case when Maine was split off from Massachusetts; and when West Virginia was split from Virginia during the Civil War. When Texas was admitted to the union in 1845, it was much larger than any other state and was specifically granted the right to divide itself into as many as five separate states.^[21]

Unrecognized entities[link]

See also: Historical regions of the United States

• The State of Franklin existed for four years not long after the end of the American Revolution, but was never recognized by the union, which ultimately recognized North Carolina's claim of sovereignty over the area. A majority of the states were willing to recognize Franklin, but the number of states in favor fell short of the two-thirds majority required to admit a territory to statehood under the Articles of Confederation. The territory comprising Franklin later became part of the state of Tennessee.
• The State of Superior was a proposed state formed out of the Upper Peninsula of Michigan. Several prominent legislators including local politician Dominic Jacobetti formally attempted this legislation in the 1970s, with no success. As a state, it would have had, by far, the smallest population, and remaining so through the present day. Its 320,000 residents would equal only 60% of Wyoming's population, and less than 50% of Alaska's population.
• The State of Deseret was a provisional state of the United States, proposed in 1849 by the Mormon settlers in Salt Lake City. The provisional state existed for slightly over two years and was never accepted by the United States Congress. Its name was derived from the word for "honeybee" in the Book of Mormon. Its territory included most of what is now Utah and Nevada.
• State of Jefferson
  • On July 24, 1859, voters defeated the formation of the proposed State of Jefferson in the Southern Rocky Mountains. On October 24, 1859, voters instead approved the formation of the Jefferson Territory, which was superseded by the Territory of Colorado on February 28, 1861.
  • In 1915, a second State of Jefferson was proposed for the northern third of Texas but failed to obtain majority approval by the Texas Senate.
  • In 1941, a third State of Jefferson was proposed in the mostly rural area of southern Oregon and northern California, but was cancelled as a result of the Japanese attack on Pearl Harbor. This proposal has been raised several times since.
• State of Lincoln
  • Lincoln is another state that has been proposed multiple times. It generally consists of the eastern portion of Washington state and the panhandle or northern portion of Idaho. It was originally proposed by Idaho in 1864 to include just the panhandle of Idaho, and again in 1901 to include eastern Washington. Proposals have come up in 1996, 1999, and 2005.
  • Lincoln is also the name of a failed state proposal after the U.S. Civil War in 1869. It consisted of the area south and west of Texas' Colorado River.

Secession[link]

The Constitution is silent on the issue of the secession of a state from the union. However, its predecessor document, the Articles of Confederation, stated that the United States of America "shall be perpetual." The question of whether or not individual states held the right to unilateral secession remained a difficult and divisive one until the American Civil War. In 1860 and 1861, eleven southern states seceded, but following their defeat in the American Civil War were brought back into the Union during the Reconstruction Era. The federal government never recognized the secession of any of the rebellious states. Following the Civil War, the United States Supreme Court, in Texas v. White, held that states did not have the right to secede and that any act of secession was legally void. Drawing on the Preamble to the Constitution, which states that the Constitution was intended to "form a more perfect union" and speaks of the people of the United States of America in effect as a single body politic, as well as the language of the Articles of Confederation, the Supreme Court maintained that states did not have a right to secede. However, the court's reference in the same decision to the possibility of such changes occurring "through revolution, or through consent of the States," essentially means that this decision holds that no state has a right to unilaterally decide to leave the Union.^[2][3]

Commonwealths[link]

Four of the states bear the formal title of commonwealth: Kentucky, Massachusetts, Pennsylvania, and Virginia. This is merely a legacy of all four states' history, and their formal name has no effect on their legal status as states.

Somewhat confusingly, the U.S. territories of the Northern Marianas and Puerto Rico are also referred to as commonwealths, and that designation does have a legal status different from that of the 50 states. Both of these commonwealths are unincorporated territories of the United States.

Origin of states' names[link]

Map showing the source languages of state names

Twenty-four of the states' names originate from Native American languages. Of these, eight are from Algonquian languages, seven are from Siouan languages, one is from Uto-Aztecan languages and five others are from other indigenous languages. Hawaii's name is derived from the Polynesian Hawaiian Language.

Of the remaining names, 22 are from European languages: Seven from Latin (mainly Latinized forms of English names), the rest are from English, Spanish and French. Eleven states are named after people, including seven named for royalty and one named after an American president. The origins of six state names are unknown or disputed.

Regional grouping[link]

U.S. Census Bureau regions:
The West, The Midwest, The South and The Northeast.

States may be grouped in regions; there are endless variations and possible groupings, as most states are not defined by obvious geographic or cultural borders. For further discussion of regions of the U.S., see the list of regions of the United States.

Borders[link]

The northern and southern borders of the Thirteen Colonies on the East Coast were largely determined by colonial charters and anchoring coastal settlements. The western boundaries were determined by the limits of transportation, the infeasibility of settling areas dominated by Native Americans and foreign powers, and the decision to create new states out of western territories.

River borders between states are common. At various times, national borders with territories formerly controlled by other countries (namely the British colonies of Canada, New France, New Spain including Spanish Florida, and Russian North America) became institutionalized as the borders of U.S. states. Alaska was formerly the colony of Russian America.

Most borders beyond the Thirteen Colonies were created by Congress as it created territories, divided them, and turned them into states as they became more populated. Territorial and new state lines followed various geographic features, economic units, and the pattern of settlement. In the West, relatively arbitrary straight lines following latitude and longitude often prevail, due to the sparseness of settlement west of the Mississippi River. Faster transportation also meant that larger states were more feasible to govern from a single capital. Vermont, California, and Texas were each briefly independent nations, as was Hawaii for a more extensive period of time. Some states were previously part of other states, including Maine, West Virginia, Kentucky, and Tennessee. Occasionally the United States Congress or the United States Supreme Court have settled state border disputes.

See also[link]

United States census statistical areas by state, district, or territory

AL

AK

AZ

AR

CA

CO

CT

DE

DC

FL

GA

HI

ID

IL

IN

IA

KS

KY

LA

ME

MD

MA

MI

MN

MS

MO

MT

NE

NV

NH

NJ

NM

NY

NC

ND

OH

OK

OR

PA

RI

SC

SD

TN

TX

UT

VT

VA

WA

WV

WI

WY

AS

MP

PR

GU

VI

• 50 State Quarters
• 51st state
• Extreme points of the United States
• Geography of the United States
• List of fictional U.S. states
• List of regions of the United States
• List of U.S. counties that share names with U.S. states
• Lists of U.S. states
• Organized incorporated territories of the United States
• Political divisions of the United States
• States' rights
• United States Constitution
• United States Declaration of Independence
  • United States Declaration of Independence (text)
• United States territorial acquisitions
• Territorial evolution of the United States
• United States territory
• Territories of the United States
• Comparison of U.S. state governments

References[link]

Further reading[link]

• Stein, Mark, How the States Got Their Shapes, New York : Smithsonian Books/Collins, 2008. ISBN 978-0-06-143138-8

External links[link]

• Information about All States from UCB Libraries GovPubs
• State Resource Guides, from the Library of Congress
• Tables with areas, populations, densities and more (in order of population)
• Tables with areas, populations, densities and more (alphabetical)
• State and Territorial Governments on USA.gov
• StateMaster – statistical database for US States.
• U.S. States: Comparisons, rankings, demographics

v t e Political divisions of the United States States Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming Federal district Washington, D.C. (District of Columbia) Insular areas American Samoa Guam Northern Mariana Islands Puerto Rico U.S. Virgin Islands Outlying islands Bajo Nuevo Bank Baker Island Howland Island Jarvis Island Johnston Atoll Kingman Reef Midway Atoll Navassa Island Palmyra Atoll Serranilla Bank Wake Island

United States of America
Flag Great Seal
Motto: In God We Trust  (official) E Pluribus Unum  (traditional) (Latin: Out of Many, One)
Anthem: "The Star-Spangled Banner"
Capital		Washington, D.C. 38°53′N 77°01′W / 38.883°N 77.017°W / 38.883; -77.017
Largest city		New York City
Official language(s)		None at federal level[a]
National language		English (de facto)[b]
Demonym		American
Government		Federal presidential constitutional republic
-	President	Barack Obama (D)
-	Vice President	Joe Biden (D)
-	Speaker of the House	John Boehner (R)
-	Chief Justice	John Roberts
Legislature		Congress
-	Upper house	Senate
-	Lower house	House of Representatives
Independence		from the Kingdom of Great Britain
-	Declared	July 4, 1776
-	Recognized	September 3, 1783
-	Current constitution	June 21, 1788
Area
-	Total	9,826,675 km2 [1][c](3rd/4th) 3,794,101 sq mi
-	Water (%)	6.76
Population
-	2012 estimate	313,802,000[2] (3rd)
-	Density	33.7/km2  87.4/sq mi
GDP (PPP)		2011 estimate
-	Total	$15.094 trillion[3] (1st)
-	Per capita	$48,386[3] (6th)
GDP (nominal)		2011 estimate
-	Total	$15.094 trillion[3] (1st)
-	Per capita	$48,386[3] (15th)
Gini (2007)		45.0[1] (39th)
HDI (2011)		0.910[4] (very high) (4th)
Currency		United States dollar ($) (USD)
Time zone		(UTC−5 to −10)
-	Summer (DST)	(UTC−4 to −10)
Date formats		m/d/yy (AD)
Drives on the		right
Internet TLD		.us .gov .mil .edu
Calling code		+1
^ a. English is the official language of at least 28 states—some sources give a higher figure, based on differing definitions of "official".[5] English and Hawaiian are both official languages in the state of Hawaii. ^ b. English is the de facto language of American government and the sole language spoken at home by 80% of Americans age five and older. Spanish is the second most commonly spoken language. ^ c. Whether the United States or China is larger is disputed. The figure given is from the U.S. Central Intelligence Agency's World Factbook. Other sources give smaller figures. All authoritative calculations of the country's size include only the 50 states and the District of Columbia, not the territories. ^ d. The population estimate includes people whose usual residence is in the fifty states and the District of Columbia, including noncitizens. It does not include either those living in the territories, amounting to more than 4 million U.S. citizens (mostly in Puerto Rico), or U.S. citizens living outside the United States.

The United States of America (commonly abbreviated to the United States, the U.S., the USA, America, and the States) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west, across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean.

At 3.79 million square miles (9.83 million km²) and with over 312 million people, the United States is the third or fourth largest country by total area, and the third largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries.^[6] The U.S. economy is the world's largest national economy, with an estimated 2011 GDP of $15.1 trillion (22% of nominal global GDP and over 19% of global GDP at purchasing-power parity).^[3][7] Per capita income is the world's sixth-highest.^[3]

Indigenous peoples descended from forebears who migrated from Asia have inhabited what is now the mainland United States for many thousands of years. This Native American population was greatly reduced by disease and warfare after European contact. The United States was founded by thirteen British colonies located along the Atlantic seaboard. On July 4, 1776, they issued the Declaration of Independence, which proclaimed their right to self-determination and their establishment of a cooperative union. The rebellious states defeated the British Empire in the American Revolution, the first successful colonial war of independence.^[8] The current United States Constitution was adopted on September 17, 1787; its ratification the following year made the states part of a single republic with a stronger central government. The Bill of Rights, comprising ten constitutional amendments guaranteeing many fundamental civil rights and freedoms, was ratified in 1791.

Through the 19th century, the United States displaced native tribes, acquired the Louisiana territory from France, Florida from Spain, part of the Oregon Country from the United Kingdom, Alta California and New Mexico from Mexico, and Alaska from Russia, and annexed the Republic of Texas and the Republic of Hawaii. Disputes between the agrarian South and industrial North over the expansion of the institution of slavery and states' rights provoked the Civil War of the 1860s. The North's victory prevented a permanent split of the country and led to the end of legal slavery in the United States. By the 1870s, its national economy was the world's largest.^[9] The Spanish–American War and World War I confirmed the country's status as a military power. It emerged from World War II as the first country with nuclear weapons and a permanent member of the United Nations Security Council. The end of the Cold War and the dissolution of the Soviet Union left the United States as the sole superpower. The country accounts for 41% of global military spending,^[10] and is a leading economic, political, and cultural force in the world.^[11]

Etymology[link]

In 1507, German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere "America" after Italian explorer and cartographer Amerigo Vespucci.^[12] The former British colonies first used the country's modern name in the 1776 Declaration of Independence, the "unanimous Declaration of the thirteen united States of America".^[13] On November 15, 1777, the Second Continental Congress adopted the Articles of Confederation, which states, "The Stile of this Confederacy shall be 'The United States of America'." The Franco-American treaties of 1778 used "United States of North America", but from July 11, 1778, "United States of America" was used on the country's bills of exchange, and it has been the official name ever since.^[14]

The short form "United States" is also standard. Other common forms include the "U.S.", the "USA", and "America". Colloquial names include the "U.S. of A." and, internationally, the "States". "Columbia", a once popular name for the United States, derives from Christopher Columbus; it appears in the name "District of Columbia".

The standard way to refer to a citizen of the United States is as an "American". Although "United States" is the official appositional term, "American" and "U.S." are more commonly used to refer to the country adjectivally ("American values", "U.S. forces"). "American" is rarely used in English to refer to people not connected to the United States.^[15]

The phrase "United States" was originally treated as plural—e.g., "the United States are"—including in the Thirteenth Amendment to the United States Constitution, ratified in 1865. It became common to treat it as singular—e.g., "the United States is"—after the end of the Civil War. The singular form is now standard; the plural form is retained in the idiom "these United States".^[16]

Geography and environment[link]

The land area of the contiguous United States is approximately 1,900 million acres (7,700,000 km²). Alaska, separated from the contiguous United States by Canada, is the largest state at 365 million acres (1,480,000 km²). Hawaii, occupying an archipelago in the central Pacific, southwest of North America, has just over 4 million acres (16,000 km²).^[17] The United States is the world's third or fourth largest nation by total area (land and water), ranking behind Russia and Canada and just above or below China. The ranking varies depending on how two territories disputed by China and India are counted and how the total size of the United States is measured: calculations range from 3,676,486 square miles (9,522,055 km²)^[18] to 3,717,813 square miles (9,629,091 km²)^[19] to 3,794,101 square miles (9,826,676 km²).^[1] Including only land area, the United States is third in size behind Russia and China, just ahead of Canada.^[20]

The Bald Eagle, national bird of the United States since 1782

The coastal plain of the Atlantic seaboard gives way further inland to deciduous forests and the rolling hills of the Piedmont. The Appalachian Mountains divide the eastern seaboard from the Great Lakes and the grasslands of the Midwest. The Mississippi–Missouri River, the world's fourth longest river system, runs mainly north–south through the heart of the country. The flat, fertile prairie of the Great Plains stretches to the west, interrupted by a highland region in the southeast. The Rocky Mountains, at the western edge of the Great Plains, extend north to south across the country, reaching altitudes higher than 14,000 feet (4,300 m) in Colorado. Farther west are the rocky Great Basin and deserts such as the Chihuahua and Mojave. The Sierra Nevada and Cascade mountain ranges run close to the Pacific coast. At 20,320 feet (6,194 m), Alaska's Mount McKinley is the tallest peak in the country and in North America. Active volcanoes are common throughout Alaska's Alexander and Aleutian Islands, and Hawaii consists of volcanic islands. The supervolcano underlying Yellowstone National Park in the Rockies is the continent's largest volcanic feature.^[21]

The United States, with its large size and geographic variety, includes most climate types. To the east of the 100th meridian, the climate ranges from humid continental in the north to humid subtropical in the south. The southern tip of Florida is tropical, as is Hawaii. The Great Plains west of the 100th meridian are semi-arid. Much of the Western mountains are alpine. The climate is arid in the Great Basin, desert in the Southwest, Mediterranean in coastal California, and oceanic in coastal Oregon and Washington and southern Alaska. Most of Alaska is subarctic or polar. Extreme weather is not uncommon—the states bordering the Gulf of Mexico are prone to hurricanes, and most of the world's tornadoes occur within the country, mainly in the Midwest's Tornado Alley.^[22]

The U.S. ecology is considered "megadiverse": about 17,000 species of vascular plants occur in the contiguous United States and Alaska, and over 1,800 species of flowering plants are found in Hawaii, few of which occur on the mainland.^[23] The United States is home to more than 400 mammal, 750 bird, and 500 reptile and amphibian species.^[24] About 91,000 insect species have been described.^[25] The Endangered Species Act of 1973 protects threatened and endangered species and their habitats, which are monitored by the United States Fish and Wildlife Service. There are fifty-eight national parks and hundreds of other federally managed parks, forests, and wilderness areas.^[26] Altogether, the government owns 28.8% of the country's land area.^[27] Most of this is protected, though some is leased for oil and gas drilling, mining, logging, or cattle ranching; 2.4% is used for military purposes.^[27]

Political divisions[link]

The United States is a federal union of fifty states. The original thirteen states were the successors of the thirteen colonies that rebelled against British rule. Early in the country's history, three new states were organized on territory separated from the claims of the existing states: Kentucky from Virginia; Tennessee from North Carolina; and Maine from Massachusetts. Most of the other states have been carved from territories obtained through war or purchase by the U.S. government. One set of exceptions comprises Vermont, Texas, and Hawaii: each was an independent republic before joining the union. During the American Civil War, West Virginia broke away from Virginia. The most recent state—Hawaii—achieved statehood on August 21, 1959.^[28] The states do not have the right to secede from the union.

The states compose the vast bulk of the U.S. land mass; the two other areas considered integral parts of the country are the District of Columbia, the federal district where the capital, Washington, is located; and Palmyra Atoll, an uninhabited but incorporated territory in the Pacific Ocean. The United States also possesses five major overseas territories: Puerto Rico and the United States Virgin Islands in the Caribbean; and American Samoa, Guam, and the Northern Mariana Islands in the Pacific.^[29] Those born in the major territories (except for American Samoa) possess U.S. citizenship.^[30] American citizens residing in the territories have many of the same rights and responsibilities as citizens residing in the states; however, they are generally exempt from federal income tax, may not vote for president, and have only nonvoting representation in the U.S. Congress.^[31]

History[link]

Native American and European settlement[link]

The indigenous peoples of the U.S. mainland, including Alaska Natives, are believed to have migrated from Asia, beginning between 40,000 and 12,000 years ago.^[32] Some, such as the pre-Columbian Mississippian culture, developed advanced agriculture, grand architecture, and state-level societies. After Europeans began settling the Americas, many millions of indigenous Americans died from epidemics of imported diseases such as smallpox.^[33]

The Mayflower transported Pilgrims to the New World in 1620, as depicted in William Halsall's The Mayflower in Plymouth Harbor, 1882.

In 1492, Genoese explorer Christopher Columbus, under contract to the Spanish crown, reached several Caribbean islands, making first contact with the indigenous people. On April 2, 1513, Spanish conquistador Juan Ponce de León landed on what he called "La Florida"—the first documented European arrival on what would become the U.S. mainland. Spanish settlements in the region were followed by ones in the present-day southwestern United States that drew thousands through Mexico. French fur traders established outposts of New France around the Great Lakes; France eventually claimed much of the North American interior, down to the Gulf of Mexico. The first successful English settlements were the Virginia Colony in Jamestown in 1607 and the Pilgrims' Plymouth Colony in 1620. The 1628 chartering of the Massachusetts Bay Colony resulted in a wave of migration; by 1634, New England had been settled by some 10,000 Puritans. Between the late 1610s and the American Revolution, about 50,000 convicts were shipped to Britain's American colonies.^[34] Beginning in 1614, the Dutch settled along the lower Hudson River, including New Amsterdam on Manhattan Island.

In 1674, the Dutch ceded their American territory to England; the province of New Netherland was renamed New York. Many new immigrants, especially to the South, were indentured servants—some two-thirds of all Virginia immigrants between 1630 and 1680.^[35] By the turn of the 18th century, African slaves were becoming the primary source of bonded labor. With the 1729 division of the Carolinas and the 1732 colonization of Georgia, the thirteen British colonies that would become the United States of America were established. All had local governments with elections open to most free men, with a growing devotion to the ancient rights of Englishmen and a sense of self-government stimulating support for republicanism. All legalized the African slave trade. With high birth rates, low death rates, and steady immigration, the colonial population grew rapidly. The Christian revivalist movement of the 1730s and 1740s known as the Great Awakening fueled interest in both religion and religious liberty. In the French and Indian War, British forces seized Canada from the French, but the francophone population remained politically isolated from the southern colonies. Excluding the Native Americans (popularly known as "American Indians"), who were being displaced, those thirteen colonies had a population of 2.6 million in 1770, about one-third that of Britain; nearly one in five Americans were black slaves.^[36] Though subject to British taxation, the American colonials had no representation in the Parliament of Great Britain.

Independence and expansion[link]

Declaration of Independence, by John Trumbull, 1817–18

Tensions between American colonials and the British during the revolutionary period of the 1760s and early 1770s led to the American Revolutionary War, fought from 1775 to 1781. On June 14, 1775, the Continental Congress, convening in Philadelphia, established a Continental Army under the command of George Washington. Proclaiming that "all men are created equal" and endowed with "certain unalienable Rights", the Congress adopted the Declaration of Independence, drafted largely by Thomas Jefferson, on July 4, 1776. That date is now celebrated annually as America's Independence Day. In 1777, the Articles of Confederation established a weak confederal government that operated until 1789.

After the British defeat by American forces assisted by the French and Spanish, Great Britain recognized the independence of the United States and the states' sovereignty over American territory west to the Mississippi River. Those wishing to establish a strong federal government with powers of taxation organized a constitutional convention in 1787. The United States Constitution was ratified in 1788, and the new republic's first Senate, House of Representatives, and president—George Washington—took office in 1789. The Bill of Rights, forbidding federal restriction of personal freedoms and guaranteeing a range of legal protections, was adopted in 1791.

Attitudes toward slavery were shifting; a clause in the Constitution protected the Atlantic slave trade only until 1808. The Northern states abolished slavery between 1780 and 1804, leaving the slave states of the South as defenders of the "peculiar institution". The Second Great Awakening, beginning about 1800, made evangelicalism a force behind various social reform movements, including abolitionism.

Territorial acquisitions by date

Americans' eagerness to expand westward prompted a long series of Indian Wars. The Louisiana Purchase of French-claimed territory under President Thomas Jefferson in 1803 almost doubled the nation's size.^[37] The War of 1812, declared against Britain over various grievances and fought to a draw, strengthened U.S. nationalism. A series of U.S. military incursions into Florida led Spain to cede it and other Gulf Coast territory in 1819. The Trail of Tears in the 1830s exemplified the Indian removal policy that stripped the native peoples of their land. The United States annexed the Republic of Texas in 1845, amid a period when the concept of Manifest Destiny was becoming popular.^[38] The 1846 Oregon Treaty with Britain led to U.S. control of the present-day American Northwest. The U.S. victory in the Mexican-American War resulted in the 1848 cession of California and much of the present-day American Southwest. The California Gold Rush of 1848–49 further spurred western migration. New railways made relocation easier for settlers and increased conflicts with Native Americans. Over a half-century, up to 40 million American bison, or buffalo, were slaughtered for skins and meat and to ease the railways' spread. The loss of the buffalo, a primary resource for the plains Indians, was an existential blow to many native cultures.

Civil War and industrialization[link]

Battle of Gettysburg, lithograph by Currier & Ives, ca. 1863

Tensions between slave and free states mounted with arguments about the relationship between the state and federal governments, as well as violent conflicts over the spread of slavery into new states. Abraham Lincoln, candidate of the largely antislavery Republican Party, was elected president in 1860. Before he took office, seven slave states declared their secession—which the federal government maintained was illegal—and formed the Confederate States of America. With the Confederate attack upon Fort Sumter, the Civil War began and four more slave states joined the Confederacy. Lincoln's Emancipation Proclamation in 1863 declared slaves in the Confederacy to be free. Following the Union victory in 1865, three amendments to the U.S. Constitution ensured freedom for the nearly four million African Americans who had been slaves,^[39] made them citizens, and gave them voting rights. The war and its resolution led to a substantial increase in federal power.^[40] The war remains the deadliest conflict in American history, resulting in the deaths of 620,000 soldiers.^[41]

Immigrants at Ellis Island, New York Harbor, 1902

After the war, the assassination of Abraham Lincoln radicalized Republican Reconstruction policies aimed at reintegrating and rebuilding the Southern states while ensuring the rights of the newly freed slaves. The resolution of the disputed 1876 presidential election by the Compromise of 1877 ended Reconstruction; Jim Crow laws soon disenfranchised many African Americans. In the North, urbanization and an unprecedented influx of immigrants from Southern and Eastern Europe hastened the country's industrialization. The wave of immigration, lasting until 1929, provided labor and transformed American culture. National infrastructure development spurred economic growth. The 1867 Alaska Purchase from Russia completed the country's mainland expansion. The Wounded Knee Massacre in 1890 was the last major armed conflict of the Indian Wars. In 1893, the indigenous monarchy of the Pacific Kingdom of Hawaii was overthrown in a coup led by American residents; the United States annexed the archipelago in 1898. Victory in the Spanish–American War the same year demonstrated that the United States was a world power and led to the annexation of Puerto Rico, Guam, and the Philippines.^[42] The Philippines gained independence a half-century later; Puerto Rico and Guam remain U.S. territories.

World War I, Great Depression, and World War II[link]

An abandoned farm in South Dakota during the Dust Bowl, 1936

At the outbreak of World War I in 1914, the United States remained neutral. Most Americans sympathized with the British and French, although many opposed intervention.^[43] In 1917, the United States joined the Allies, and the American Expeditionary Forces helped to turn the tide against the Central Powers. After the war, the Senate did not ratify the Treaty of Versailles, which established the League of Nations. The country pursued a policy of unilateralism, verging on isolationism.^[44] In 1920, the women's rights movement won passage of a constitutional amendment granting women's suffrage. The prosperity of the Roaring Twenties ended with the Wall Street Crash of 1929 that triggered the Great Depression. After his election as president in 1932, Franklin D. Roosevelt responded with the New Deal, a range of policies increasing government intervention in the economy, including the establishment of the Social Security system.^[45] The Dust Bowl of the mid-1930s impoverished many farming communities and spurred a new wave of western migration.

Soldiers of the U.S. Army 1st Infantry Division landing in Normandy on D-Day, June 6, 1944

The United States, effectively neutral during World War II's early stages after Nazi Germany's invasion of Poland in September 1939, began supplying materiel to the Allies in March 1941 through the Lend-Lease program. On December 7, 1941, the Empire of Japan launched a surprise attack on Pearl Harbor, prompting the United States to join the Allies against the Axis powers as well as the internment of Japanese Americans by the thousands.^[46] Participation in the war spurred capital investment and industrial capacity. Among the major combatants, the United States was the only nation to become richer—indeed, far richer—instead of poorer because of the war.^[47] Allied conferences at Bretton Woods and Yalta outlined a new system of international organizations that placed the United States and Soviet Union at the center of world affairs. As victory was won in Europe, a 1945 international conference held in San Francisco produced the United Nations Charter, which became active after the war.^[48] The United States, having developed the first nuclear weapons, used them on the Japanese cities of Hiroshima and Nagasaki in August. Japan surrendered on September 2, ending the war.^[49]