Three gold nuggets from Tuolumne County, California, similar to what the early miners would have found.

Gold in California became highly concentrated there as the result of global forces operating over hundreds of millions of years. Volcanoes, tectonic plates and erosion all combined to concentrate billions of dollars worth of gold in the mountains of California. During the California Gold Rush, gold-seekers known as "Forty-Niners" retrieved this gold, at first using simple techniques, and then developing more sophisticated techniques, which spread around the world.

Geology[link]

Gold-bearing magma rising after being subducted under the continental crust.

Scientists believe that over a span of at least 400 million years, gold that had been widely dispersed in the Earth’s crust became more concentrated by geologic actions into the gold-bearing regions of California. Only gold that is concentrated can be economically recovered. Some 400 million years ago, California lay at the bottom of a large sea; underwater volcanoes deposited lava and minerals (including gold) onto the sea floor; sometimes enough that islands were created.^[1] Between 400 million and 200 million years ago, geologic movement forced the sea floor and these volcanic islands and deposits eastwards, colliding with the North American continent, which was moving westwards.^[2]

Beginning about 200 million years ago, tectonic pressure forced the sea floor beneath the American continental mass.^[3] As it sank, or subducted, beneath today's California, the sea floor heated and melted into very large molten masses (magma). Being lighter and hotter than the ancient continental crust above it, this magma forced its way upward, cooling as it rose^[4] to become the granite rock found throughout the Sierra Nevada and other mountains in California today — such as the sheer rock walls and domes of Yosemite Valley.^[5] As the hot magma cooled, solidified, and came in contact with water, minerals with similar melting temperatures tended to concentrate themselves together.^[5] As it solidified, gold became concentrated within the magma, and during this cooling process, veins of gold formed within fields of quartz^[4] because of the similar melting temperatures of both.^[6]

Goldfields in the mountains of northern and central California.

As the Sierra Nevada and other mountains in California were forced upwards by the actions of tectonic plates, the solidified minerals and rocks were raised to the surface and exposed to rain, ice and snow.^[7] The surrounding rock then eroded and crumbled, and the exposed gold and other materials were carried downstream by water. Because gold is denser than almost all other minerals, this process further concentrated the gold as it sank, and pockets of gold gathered in quiet gravel beds along the sides of old rivers and streams.^[8]

The California mountains rose and shifted several times within the last fifty million years, and each time, old streambeds moved and were dried out, leaving the deposits of gold resting within the ancient gravel beds where the gold had been collecting.^[9] Newer rivers and streams then developed, and some of these cut through the old channels, carrying the gold into still larger concentrations.^[9]

The Forty-Niners of the California Gold Rush first focused their efforts on these deposits of gold, which had been gathered in the gravel beds by hundreds of millions of years of geologic action.

Gold recovery[link]

The early Forty-Niners panned for gold in California’s rivers and streams, or used "cradles" and "rockers" or "long-toms,"^[10] forms of placer mining.^[11][12] Modern estimates by the U.S. Geological Survey are that some 12 million ounces (373 t) of gold were removed in the first five years of the Gold Rush (worth approximately US$7.2 billion at November 2006 prices).^[13]

By 1853, the first hydraulic mining was used.^[14] In hydraulic mining, (which was invented in California) a powerful stream of water is directed at gold-bearing gravel beds; the gravel and gold then pass over sluices, with the gold settling to the bottom. By the mid-1880s, it is estimated that 11 million ounces (342 t) of gold (worth approximately US$6.6 billion at November 2006 prices) had been recovered via "hydraulicking."^[13]

The final stage to recover loose gold was to prospect for gold in the flat rivers of California’s Central Valley and other gold-bearing areas of California (such as Scott Valley in Siskiyou County). By the late 1890s, dredging technology (which was also invented in California) had become economical,^[15] and it is estimated that more than 20 million ounces (622 t) were recovered by dredging (worth approximately US$12 billion at November 2006 prices).^[13]

Gold in quartz from the 16 to 1 Mine, Sierra County, California, similar to high-grade gold ore from the early days of "quartz mining".

Gold-seekers also engaged in "hard-rock" mining, that is, extracting the gold directly from the rock that contained it (typically quartz)^[16] Once the gold-bearing rocks were brought to the surface, the rocks were crushed, and the gold was separated out (using moving water), or leached out, typically by using arsenic or mercury.^[17] Eventually, hard-rock mining wound up being the single largest source of gold produced in the Gold Country.^[13]

Geological after-effects[link]

There were decades of minor earthquakes, more than at any other time in the historical record for Northern California, before the 1906 San Francisco earthquake. Previously interpreted as precursory activity to the 1906 earthquake, they have been found to have a strong seasonal pattern and due to large seasonal sediment loads in coastal bays that overlie faults as a result of mining of gold inland.^[18]

Notes[link]

References[link]

• Bancroft, Hubert Howe (1884–1890) History of California, vols. 18-24, The works of Hubert Howe Bancroft, complete text online
• Brands, H.W. (2003). The age of gold: the California Gold Rush and the new American dream. New York City: Doubleday. ISBN 0-385-72088-2. 
• Hill, Mary (1999). Gold: the California story. Berkeley and Los Angeles: University of California Press. ISBN 0-520-21547-8. 
• Rawls, James J. and Orsi, Richard J. (eds.) (1999). A golden state: mining and economic development in Gold Rush California (California History Sesquicentennial Series, 2). Berkeley and Los Angeles: University of California Press. ISBN 0-520-21771-3. 
• Starr, Kevin (2005). California: a history. New York: The Modern Library. ISBN 0-679-64240-4. 

State of California Flag Seal Nickname(s): The Golden State Motto(s): Eureka[1] Official language(s) English Spoken language(s) English (only) 57.6% Spanish 28.2%[2] Demonym Californian Capital Sacramento Largest city Los Angeles Largest metro area Greater Los Angeles Area Area  Ranked 3rd in the U.S.  - Total 163,696 sq mi (423,970 km2)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4.7  - Latitude 32° 32′ N to 42° N  - Longitude 114° 8′ W to 124° 26′ W Population  Ranked 1st in the U.S.  - Total 37,691,912 (2011 est)[3]  - Density 242/sq mi  (93.3/km2) Ranked 11th in the U.S.  - Median household income  US$61,021 (9th) Elevation    - Highest point Mount Whitney[4][5][6][7] 14,505 ft (4421.0 m)  - Mean 2,900 ft  (880 m)  - Lowest point Badwater Basin in Death Valley[5][6] −282[8] ft (-86.0 m) Before statehood California Republic Admission to Union  September 9, 1850 (31st) Governor Jerry Brown (D) Lieutenant Governor Gavin Newsom (D)[9] Legislature California State Legislature  - Upper house California State Senate  - Lower house California State Assembly U.S. Senators Dianne Feinstein (D) Barbara Boxer (D) U.S. House delegation 34 Democrats, 19 Republicans (list) Time zone Pacific: UTC -8/-7 Abbreviations CA Calif. US-CA Website www.ca.gov California State symbols The Flag of California. The Seal of California. Animate insignia Bird(s) California Quail Fish Golden Trout Flower(s) California Poppy Grass Purple Needlegrass Insect California Dogface Butterfly Mammal(s) California grizzly bear (State Animal )[1] Reptile Desert Tortoise Tree California Redwood Inanimate insignia Beverage Wine Colors Blue & Gold Dance West Coast Swing Fossil Sabre-toothed cat Gemstone Benitoite Mineral Native Gold Rock Serpentine Soil San Joaquin Song(s) "I Love You, California" Tartan California State Tartan Route marker(s) State Quarter Released in 2005 Lists of United States state insignia

California (pronounced ⁱ/kælɨˈfɔrnjə/) is a state located on the West Coast of the United States. It is by far the most populous U.S. state,^[10] and the third most extensive (after Alaska and Texas). It is home to the nation's second- and sixth-largest census statistical areas (Los Angeles Metropolitan Area and San Francisco Bay Area), and eight of the nation's fifty most populated cities (Los Angeles, San Diego, San Jose, San Francisco, Fresno, Sacramento, Long Beach and Oakland).^[11] The capital city is Sacramento.

California's diverse geography ranges from the Pacific Coast in the west, to the Sierra Nevada mountains in the east – from the Redwood–Douglas-fir forests of the northwest, to the Mojave Desert areas in the southeast. The center of the state is dominated by Central Valley, a major agricultural area. California contains both the highest and lowest points in the contiguous United States (Mount Whitney and Death Valley), and has the third-longest coastline of all states (after Alaska and Florida). Earthquakes are a common occurrence due to the state's location along the Pacific Ring of Fire: about 37,000 are recorded annually.^[12]

The name California once referred to a large area of North America claimed by Spain that included much of modern-day Southwestern United States and the Baja California peninsula. Beginning in the late 18th century, the area known as Alta California, comprising the California territory north of the Baja Peninsula, was colonized by the Spanish Empire as part of New Spain. In 1821, Alta California became a part of Mexico following its successful war for independence. Shortly after the beginning of the Mexican-American War in 1846, a group of American settlers in Sonoma declared an independent California Republic in Alta California. Though its existence was short-lived, its flag became the precursor for California's current state flag. American victory in the war led to the Treaty of Guadalupe Hidalgo, in which Mexico ceded Alta California to the United States. Western areas of Alta California became the state of California, which was admitted as the 31st state on September 9, 1850.

The California Gold Rush beginning in 1848 led to dramatic social and demographic change, with large scale immigration from the U.S. and abroad and an accompanying economic boom. Key developments in the early 20th century included the emergence of Los Angeles as the center of the American entertainment industry, and the growth of a large, state-wide tourism sector. The late 20th century saw the development of the technology and information sectors, punctuated by the growth of Silicon Valley. California's prosperous agricultural industry also emerged; at least half of the fresh fruit produced in the United States are now cultivated in California, and the state also leads in the production of vegetables.^[13] Other important contributors to its economy include aerospace, education, and manufacturing. If California were a country, it would be the eighth-largest economy in the world^[14] and the 34th most populous nation.

Etymology[link]

Welcome to California sign

The word California originally referred to the entire region composed of the Baja California peninsula of Mexico, the current U.S. states of California, Nevada, and Utah, and parts of Arizona, New Mexico, and Wyoming.

The name California is most commonly believed to have derived from a fictional paradise peopled by Black Amazons and ruled by Queen Calafia.^[15][16] The story of Calafia is recorded in a 1510 work The Adventures of Esplandián, written as a sequel to Amadis de Gaula by Spanish adventure writer Garci Rodríguez de Montalvo.^[17][18][19] The kingdom of Queen Calafia, according to Montalvo, was said to be a remote land inhabited by griffins and other strange beasts, and rich in gold.

Know ye that at the right hand of the Indies there is an island called California, very close to that part of the Terrestrial Paradise, which was inhabited by black women without a single man among them, and they lived in the manner of Amazons. They were robust of body with strong passionate hearts and great virtue. The island itself is one of the wildest in the world on account of the bold and craggy rocks.

— Chapter CLVII of The Adventures of Esplandián^[20]

The name California is the fifth oldest surviving European place-name in the US and was applied to what is now the southern tip of Baja California peninsula as the Island of California by a Spanish expedition led by Diego de Becerra and Fortún Ximénez, who landed there in 1533 at the behest of Hernán Cortés.^{[note 1]}

Geography[link]

Topographic map of California

Aerial view of the California Central Valley

Sierra Nevada

Yosemite National Park

Lake Tahoe

California adjoins the Pacific Ocean to the west, Oregon to the north, Nevada and Arizona to the east, and the Mexican state of Baja California to the south. With an area of 160,000 square miles (414,000 km²), it is the third-largest state in the United States in size, after Alaska and Texas.^[22] If it were a country, California would be the 59th-largest in the world in area.

In the middle of the state lies the California Central Valley, bounded by the coastal mountain ranges in the west, the Sierra Nevada to the east, the Cascade Range in the north and the Tehachapi Mountains in the south. The Central Valley is California's agricultural heartland and grows approximately one-third of the nation's food.^[23][24]

Divided in two by the Sacramento-San Joaquin River Delta, the northern portion, the Sacramento Valley serves as the watershed of the Sacramento River, while the southern portion, the San Joaquin Valley is the watershed for the San Joaquin River; both areas derive their names from the rivers that transit them. With dredging, the Sacramento and the San Joaquin Rivers have remained sufficiently deep that several inland cities are seaports.

The Sacramento-San Joaquin River Delta serves as a critical water supply hub for the state. Water is routed through an extensive network of canals and pumps out of the delta, that traverse nearly the length of the state, including the Central Valley Project and the State Water Project. Water from the Delta provides drinking water for nearly 23 million people, almost two-thirds of the state's population, and provides water to farmers on the west side of the San Joaquin Valley. The Channel Islands are located off the southern coast.

The Sierra Nevada (Spanish for "snowy range") includes the highest peak in the contiguous forty-eight states, Mount Whitney, at 14,505 ft (4421 m).^[4][5][6] The range embraces Yosemite Valley, famous for its glacially carved domes, and Sequoia National Park, home to the giant sequoia trees, the largest living organisms on Earth, and the deep freshwater lake, Lake Tahoe, the largest lake in the state by volume.

To the east of the Sierra Nevada are Owens Valley and Mono Lake, an essential migratory bird habitat. In the western part of the state is Clear Lake, the largest freshwater lake by area entirely in California. Though Lake Tahoe is larger, it is divided by the California/Nevada border. The Sierra Nevada falls to Arctic temperatures in winter and has several dozen small glaciers, including Palisade Glacier, the southernmost glacier in the United States.

About 45 percent of the state's total surface area is covered by forests,^[25] and California's diversity of pine species is unmatched by any other state. California contains more forestland than any other state except Alaska. Many of the trees in the California White Mountains are the oldest in the world; one Bristlecone pine has an age of 4,700 years.

In the south is a large inland salt lake, the Salton Sea. The south-central desert is called the Mojave; to the northeast of the Mojave lies Death Valley, which contains the lowest and hottest place in North America, the Badwater Basin at −282 feet (−86.0 m).^[8] The horizontal distance from the nadir of Death Valley to the summit of Mount Whitney is less than 90 miles (140 km). Indeed, almost all of southeastern California is arid, hot desert, with routine extreme high temperatures during the summer. The southeastern border of California with Arizona is entirely formed by the Colorado River, from which the southern part of the state gets about half of its water.

Along the California coast are several major metropolitan areas, including Greater Los Angeles Area, the San Francisco Bay Area, and the San Diego metropolitan area.

As part of the Ring of Fire, California is subject to tsunamis, floods, droughts, Santa Ana winds, wildfires, landslides on steep terrain, and has several volcanoes. It sees numerous earthquakes due to several faults, in particular the San Andreas Fault.

Climate[link]

Snow on the mountains of Southern California.

Death Valley, in the desert regions of Eastern California

California's climate varies from Mediterranean to subarctic.

Much of the state has a Mediterranean climate, with cool, rainy winters and dry summers. The cool California Current offshore often creates summer fog near the coast. Farther inland, one encounters colder winters and hotter summers.

Northern parts of the state average higher annual rainfall than the south. California's mountain ranges influence the climate as well: some of the rainiest parts of the state are west-facing mountain slopes. Northwestern California has a temperate climate, and the Central Valley has a Mediterranean climate but with greater temperature extremes than the coast. The high mountains, including the Sierra Nevada, have a mountain climate with snow in winter and mild to moderate heat in summer.

The east side of California's mountains produce a rain shadow, creating expansive deserts. The higher elevation deserts of eastern California see hot summers and cold winters, while the low deserts east of the southern California mountains experience hot summers and nearly frostless mild winters. Death Valley, a desert with large expanses below sea level, is considered the hottest location in North America; the highest temperature in the Western Hemisphere, 134 °F (57 °C), was recorded there on July 10, 1913. The lowest temperature in California was −45 °F in 1937 in Boca.

Ecology[link]

California is one of the richest and most diverse parts of the world, and includes some of the most endangered ecological communities. California is part of the Nearctic ecozone and spans a number of terrestrial ecoregions.^[26]

California's large number of endemic species includes relict species, which have died out elsewhere, such as the Catalina Ironwood (Lyonothamnus floribundus). Many other endemics originated through differentiation or adaptive radiation, whereby multiple species develop from a common ancestor to take advantage of diverse ecological conditions such as the California lilac (Ceanothus). Many California endemics have become endangered, as urbanization, logging, overgrazing, and the introduction of exotic species have encroached on their habitat.

Flora and fauna[link]

Giant sequoias in Calaveras Big Trees State Park

Joshua trees in Inyo Mountains above Eureka Valley.

California boasts several superlatives in its collection of flora: the largest trees, the tallest trees, and the oldest trees. California's native grasses are perennial plants.^[27] After European contact, these were generally replaced by invasive species of European annual grasses; and, in modern times, California's hills turn a characteristic golden-brown in summer.^[28]

Because California has the greatest diversity of climate and terrain, the state has six life zones which are the lower Sonoran (desert); upper Sonoran (foothill regions and some coastal lands), transition (coastal areas and moist northeastern counties); and the Canadian, Hudsonian, and Arctic Zones, comprising the state's highest elevations.^[29]

Plant life in the dry climate of the lower Sonoran zone contains a diversity of native cactus, mesquite, and paloverde. The Joshua tree is found in the Mojave Desert. Flowering plants include the dwarf desert poppy and a variety of asters. Fremont cottonwood and valley oak thrive in the Central Valley. The upper Sonoran zone includes the chaparral belt, characterized by forests of small shrubs, stunted trees, and herbaceous plants. Nemophila, mint, phacelia, viola, and the California poppy (Eschscholtzia californica) – the state flower – also flourish in this zone, along with the lupine, more species of which occur here than anywhere else in the world.^[29]

The transition zone includes most of California's forests with the redwood (Sequoia sempervirens) and the "big tree" or giant sequoia (Sequoia gigantea), among the oldest living things on earth (some are said to have lived at least 4,000 years). Tanbark oak, California laurel, Sugar Pine, madrona, broad-leaved maple, and Douglas-fir also grow here. Forest floors are covered with swordfern, alumnroot, barrenwort, and trillium, and there are tickets of huckleberry, azalea, elder, and wild currant. Characteristic wild flowers include varieties of mariposa, tulip, and tiger and leopard lilies.^[30]

The high elevations of the Canadian zone allow the Jeffrey Pine, red fir, and Lodgepole Pine to thrive. Brushy areas are abundant with dwarf manzanita and ceanothus; the unique Sierra puffball is also found here. Right below the timeberline, in the Hudsonian zone, the whitebark, foxtail, and silver pines grow. At about 10,500 ft (3,200 m), begins the Arctic zone, a treeless region whose flora include a number of wildflowers, including Sierra primrose, yellow columbine, alpine buttercup, and alpine shooting star.^[29][31]

Common plants that have been introduced to the state include the eucalyptus, acacia, pepper tree, geranium, and Scotch broom. The species that are federally classified as endangered are the Contra Costa wallflower, Antioch Dunes evening primrose, Solano Grass, San Clemente Island larkspur, salt marsh bird's beak, McDonald's rock-cress, and Santa Barbara Island Liveforever. As of December 1997^[update], 85 plant species were listed as threatened or endangered.^[29]

In the deserts of the lower Sonoran zone, the mammals include the jackrabbit, kangaroo rat, squirrel, and opossum. Common birds include the owl, roadrunner, Cactus Wren, and various species of hawk. The area's reptilian life include the sidewinder viper, desert tortoise, and horned toad. The upper Sonoran zone boasts mammals such as the antelope, brown-footed woodrat, and Ring-tailed Cat. Birds unique to this zone are the California thrasher, bushtit, and California Condor.^{[29][32][33][34]}

In the transition zone, there are Colombian Black-tailed Deer, black bears, gray foxes, cougars, bobcats, and Roosevelt elk. Reptiles such as the garter snakes and rattlesnakes inhabit the zone. In addition, amphibians such as the water puppy and redwood salamander are common too. Birds such as the kingfisher, chickadee, towhee, and hummingbird thrive here as well.^[29][35]

The Canadian zone mammals include the Mountain Weasel, Snowshoe Hare, and several species of chipmunks. Conspicuous birds include the blue-fronted jay, Sierra chickadee. Sierra hermit thrush, water ouzel, and Townsend's solitaire. As one ascends into the Hudsonian zone, birds become scarcer. While the Sierra rosy finch is the only bird native to the high Arctic region, other bird species such as the hummingbird and Clark's Nutcracker. Principal mammals found in this region include the Sierra coney, White-tailed Jackrabbit, and the Bighorn Sheep. As of April 2003^[update], the Bighorn Sheep was listed as endangered by the US Fish and Wildlife Service. The fauna found throughout several zones are the mule deer, coyote, mountain lion, Northern Flicker, and several species of hawk and sparrow.^[29]

Aquatic life in California thrives, from the state's mountain lakes and streams to the rocky Pacific coastline. Numerous trout species are found, among them rainbow, golden, and Tahoe. Migratory species of salmon are common as well. Deep-sea life forms include sea bass, yellowfin tuna, barracuda, and several types of whale. Native to the cliffs of northern California are seals, sea lions, and many types of shorebirds, including migratory species.^[29]

As of April 2003, 118 California animals were on the federal endangered list; 181 plants were listed as endangered or threatened. Endangered animals include the San Joaquin kitfox, Point Arena mountain beaver, Pacific pocket mouse, Salt Marsh Harvest Mouse, Morro Bay kangaroo rat (and five other species of kangaroo rat), Amargosa vole, California Least Tern, California Condor, Loggerhead Shrike, San Clemente sage sparrow, San Francisco garter snake, five species of salamander, three species of chub, and two species of pupfish. Eleven butterflies are also endangered and two that are threatened are on the federal list. Among threatened animals are the coastal California Gnatcatcher, Paiute cutthroat trout, southern sea otter, and Northern Spotted Owl. California has a total of 290,821 acres (1,176.91 km²) of National Wildlife Refuges.^[29] As of September 2010^[update], 123 California animals were listed as either endangered or threatened on the federal list provided by the US Fish & Wildlife Service.^[36] Also, as of the same year^[update], 178 species of California plants were listed either as endangered or threatened on this federal list.^[36]

Rivers[link]

The state's coasts, rivers, and other bodies of water are looked after by the California Coastal Commission.

The two most prominent rivers within California are the Sacramento River and the San Joaquin River, which drain the Central Valley and the west slope of the Sierra Nevada and flow to the Pacific Ocean through San Francisco Bay. Several major tributaries feed into the Sacramento and the San Joaquin, including the Pit River, the Tuolumne River, and the Feather River.

The Owens River takes runoff from the southeastern slopes of the Sierra Nevada and flows into Owens Lake. The Eel River and Salinas River each drain portions of the California coast, north and south of San Francisco Bay, respectively. The Mojave River is the primary watercourse in the Mojave Desert, and the Santa Ana River drains much of the Transverse Ranges as it bisects Southern California.

Some other important rivers are the Klamath River and the Trinity River in the far north coast, and the Colorado River on the southeast border with Arizona.

Regions[link]

Mount Whitney (l), the highest point in the Contiguous U.S., is less than 90 miles (140 km) away from Badwater Basin in Death Valley (r), the lowest point in North America

History[link]

History of California
This article is part of a series
Timeline
To 1899
Gold Rush (1848)
US Civil War (1861-1865)
Since 1900
Topics
Maritime · Railroad ·
Highways · Slavery
Cities
Los Angeles · San Franicsco ·
San Diego · San Jose ·
Sacramento
California Portal v t e

Settled by successive waves of arrivals during the last 10,000 years, California was one of the most culturally and linguistically diverse areas in pre-Columbian North America; The Indigenous peoples of California included more than 70 distinct groups of Native Americans, ranging from large, settled populations living on the coast to groups in the interior. California groups also were diverse in their political organization with bands, tribes, villages, and on the resource-rich coasts, large chiefdoms, such as the Chumash, Pomo and Salinan. Trade, intermarriage and military alliances fostered many social and economic relationships among the diverse groups.

The first European to explore the coast as far north as the Russian River was the Portuguese Juan Rodríguez Cabrillo in 1542. Some 37 years later English explorer Francis Drake also explored and claimed an undefined portion of the California coast in 1579. Spanish traders made unintended visits with the Manila Galleons on their return trips from the Philippines beginning in 1565.^[37] Sebastián Vizcaíno explored and mapped the coast of California in 1602 for New Spain.

The Russians from Alaska established their largest settlement in California, Fort Ross, in 1812.

Beginning in the 1820s, trappers and settlers from the U.S. and Canada began to arrive in Northern California. These new arrivals used the Siskiyou Trail, California Trail, Oregon Trail and Old Spanish Trail to cross the rugged mountains and harsh deserts surrounding California. In this period, Imperial Russia explored the California coast and established a trading post at Fort Ross.

Spanish missionaries began setting up 21 California Missions along the coast of what became known as Alta California (Upper California), together with small towns and presidios. In 1821 the Mexican War of Independence gave Mexico (including California) independence from Spain; for the next 25 years, Alta California remained a remote northern province of the nation of Mexico. Cattle ranches, or ranchos, emerged as the dominant institutions of Mexican California. After Mexican independence from Spain, the chain of missions became the property of the Mexican government and were secularized by 1832. The ranchos developed under ownership by Californios (Spanish-speaking Californians) who had received land grants, and traded cowhides and tallow with Boston merchants.

San Francisco harbor c. 1850. Between 1847 and 1870, the population of San Francisco increased from 500 to 150,000.

In 1846 settlers rebelled against Mexican rule during the Bear Flag Revolt. Afterwards, rebels raised the Bear Flag (featuring a bear, a star, a red stripe and the words "California Republic") at Sonoma. The Republic's first and only president was William B. Ide,^[38] who played a pivotal role during the Bear Flag Revolt.

The California Republic was short lived; the same year marked the outbreak of the Mexican-American War (1846–1848). When Commodore John D. Sloat of the United States Navy sailed into Monterey Bay and began the military occupation of California by the United States, Northern California capitulated in less than a month to the U.S. forces. After a series of defensive battles in Southern California, the Treaty of Cahuenga was signed by the Californios on January 13, 1847, securing American control in California. Following the Treaty of Guadalupe Hidalgo that ended the war, the region was divided between Mexico and the U.S.; the western territory of Alta California, was to become the U.S. state of California, and Arizona, Nevada, Colorado and Utah became U.S. Territories, while the lower region of California, the Baja Peninsula, remained in the possession of Mexico.

In 1848 the non-native population of California was estimated to be no more than 15,000. After gold was discovered, the population burgeoned with U.S. citizens, Europeans and other immigrants during the great California Gold Rush. By 1854 over 300,000 settlers had come.^[39] On September 9, 1850, as part of the Compromise of 1850, California was admitted to the United States undivided as a free state, denying the expansion of slavery to the Pacific Coast.

However, California's native population precipitously declined due to murder, starvation, and infections. Like in other states, the native inhabitants were forcefully removed from their lands by incoming miners, ranchers, and farmers. And despite the fact that California entered the union as a free state, the Native population was enslaved under the 1853 Act for the Government and Protection of Indians.^[40] There were several massacres, including the Yontoket Massacre, the Bloody Island Massacre at Clear Lake, and the Old Shasta Massacre, in which hundreds of indigenous people were killed. Between 1850 and 1860, California paid around 1.5 million dollars (some 250,000 of which was reimbursed by the federal government)^[41] to hire militias whose purpose was to protect settlers from the indigenous populations. In subsequent decades, the native population was placed in reservations and rancherias, which were often very small and isolated and lacked adequate natural resources or funding from the government to sustain the populations living on them.^[40] As a result, the rise of California brought great hardship for the native inhabitants. Several scholars, including Benjamin Madley and Ed Castillo, have described the actions of the California government as a genocide.^[42]

The seat of government for California under Spanish and later Mexican rule was located at Monterey from 1777 until 1835, when Mexican authorities abandoned^{[dubious – discuss]} California, leaving their missions and military forts behind.^[43] In 1849 the Constitutional Convention was first held there. Among the duties was the task of determining the location for the new state capital. The first legislative sessions were held in San Jose (1850–1851). Subsequent locations included Vallejo (1852–1853), and nearby Benicia (1853–1854); these locations eventually proved to be inadequate as well. The capital has been located in Sacramento since 1854^[44] with only a short break in 1861 when legislative sessions were held in San Francisco due to flooding in Sacramento.

Hollywood film studios, 1922

Initially, travel between California and the rest of the continental U.S. was time consuming and dangerous. A more direct connection came in 1869 with the completion of the First Transcontinental Railroad through Donner Pass in the Sierra Nevada mountains. Once completed, hundreds of thousands of U.S. citizens came west, where new Californians were discovering that land in the state, if irrigated during the dry summer months, was extremely well suited to fruit cultivation and agriculture in general. Vast expanses of wheat, other cereal crops, vegetable crops, cotton, and nut and fruit trees were grown (including oranges in Southern California), and the foundation was laid for the state's prodigious agricultural production in the Central Valley and elsewhere.

Migration to California accelerated during the early-20th century with the completion of major transcontinental highways like the Lincoln Highway and Route 66. In the period from 1900 to 1965, the population grew from fewer than one million to become the most populous state in the Union. In order to meet the population's needs, major engineering feats like the California and Los Angeles Aqueducts; the Oroville and Shasta Dams; and the Bay and Golden Gate Bridges were built across the state. The state government also adopted the California Master Plan for Higher Education in 1960 to develop a highly efficient system of public education.

Meanwhile, attracted to the mild Mediterranean climate, cheap land, and the state's wide variety of geography, filmmakers established the studio system in Hollywood in the 1920s. A couple of decades later, Stanford University and its Dean of Engineering Frederick Terman began encouraging faculty and graduates to stay in California instead of leaving the state, and develop a high-tech region in the area now known as Silicon Valley.^[45] As a result of these efforts, California is currently regarded as a world center of the entertainment and music industries, of technology and engineering businesses, and as the U.S. center of agricultural production.

Demographics[link]

The population density of California.

Population[link]

The United States Census Bureau estimates that the population of California was 37,691,912 on July 1, 2011, a 1.2% increase since the 2010 United States Census.^[3] Between 2000 and 2009, there was a natural increase of 3,090,016 (5,058,440 births minus 2,179,958 deaths).^[49] During this time period, international migration produced a net increase of 1,816,633 people while domestic migration produced a net decrease of 1,509,708, resulting in a net in-migration of 306,925 people.^[49] The State of California's own statistics show a population of 38,292,687 for January 1, 2009.^[11]

California is the second-most-populous sub-national entity in the Western Hemisphere and the Americas, with a population second to that of State of São Paulo, Brazil.^[50] California's population is greater than that of all but 34 countries of the world.^[51][52] Also, Los Angeles County has held the title of most populous U.S. county for decades, and it alone is more populous than 42 U.S. states.^[53][54] In addition, California is home to eight of the 50 most populous cities in the United States: Los Angeles (2nd), San Diego (8th), San Jose (10th), San Francisco (13th), Fresno (34th), Sacramento (35th), Long Beach (36th), and Oakland (47th). The center of population of California is located in the town of Buttonwillow, Kern County.^{[note 2]}

In 2010, illegal aliens constituted an estimated 7.3 percent of the population, the third highest percentage of any state in the country,^[56][57] totaling nearly 2.6 million.^[58] More than half originate from Mexico.^[58]

Starting in the year 2010, for the first time since the California Gold Rush, California-born residents make up the majority of the state's population.^[59]

Racial and ancestral makeup[link]

This section's factual accuracy may be compromised due to out-of-date information. Please help improve the article by updating it. There may be additional information on the talk page. (October 2011)

According to the 2010 U.S. Census Bureau:

• 57.6% White (40.1% Non-Hispanic White)
• 13.0% Asian (3.2% Chinese, 3.2% Filipino, 1.6% Vietnamese, 1.4% Indian, 1.2% Korean, 0.7% Japanese, 0.2% Hmong, 0.2% Cambodian, 0.2% Laotian, 0.1% Thai, 0.1% Pakistani)
• 6.2% Black or African American
• 1.0% Native American
• 4.9% Multiracial (1.3% White and "Some Other Race", 1.2% White and Asian, 0.6% White and Native American, 0.5% White and Black, 1.3% Other)
• 0.4% Native Hawaiian or Pacific Islander (0.1% Samoan, 0.1% Guamanian or Chamorro, 0.1% Native Hawaiian, 0.2% "Other Pacific Islander")
• 37.6% are Hispanic or Latino (of any race) (30.7% Mexican, 1.5% Salvadoran, 0.9% Guatemalan, 0.5% Puerto Rican, 0.3% Nicaraguan, 0.2% Honduran, 0.2% Cuban, 0.2% Colombian, 0.2% Peruvian)

The principal ancestries of California's residents in 2009 has been surveyed to be:^[60]

• 30.6% Mexican
• 9.8% German
• 7.8% Irish
• 6.9% English
• 4.3% Italian

San Francisco is well-known for its liberal politics and its diverse population.

With regard to demographics, California has the largest population of White Americans in the U.S., an estimated 22,189,514 residents, although most demographic surveys do not measure actual genetic ancestry. The state has the fifth-largest population of African Americans in the U.S., an estimated 2,250,630 residents. California's Asian American population is estimated at 4.4 million, approximately one-third of the nation's 13.1 million Asian Americans. California's Native American population of 285,162 is the most of any state.^[61]

According to estimates from 2008, California has the largest minority population in the United States by numbers, making up 57% of the state population.^[47] In 2000, Hispanics comprised 32% of the population; that number grew to 37% in 2008.^[62] Non-Hispanic whites decreased from 80% of the state's population in 1970 to 42% in 2008.^[47][63]

Approximately 26% of California's public school students in the 2011–12 school year identified themselves as white (non-Hispanic), and 52.1% of the state's students identified themselves as Hispanic or Latino. The following ethnic groups that made up the statewide public school student body were Asians (11.1%), African Americans (6.5%), Native Americans (0.7%), and Pacific Islanders (0.6%). Students of mixed race made up 2.1% of the public schools. Hispanics made up the majority of the state's public schools since 2010. Los Angeles Unified School District, the largest school district in California and second largest in the nation, is 73.4% Hispanic, 9.5% African American, 9.0% non-Hispanic Caucasian, 6.2% Asian, 0.5% Native American, and 0.4% Pacific Islander.^[64][65] While the population of minorities accounts for 102 million of 301 million U.S. residents, 20% of the national total live in California.^[61][66]

March supporting immigration reform, downtown Los Angeles, May 1, 2006

Languages[link]

As of 2005, 57.6% of California residents age five and older spoke English as a first language at home, while 28.2% spoke Spanish. In addition to English and Spanish, 2.0% spoke Filipino, 1.6% spoke Chinese (which included Cantonese [0.6%] and Mandarin [0.4%]), 1.4% spoke Vietnamese, and 1.1% spoke Korean as their mother tongue. In total, 42.4% of the population spoke languages other than English.^[67][68] California was historically one of the most linguistically diverse areas in the world, and is home to more than 70 indigenous languages derived from 64 root languages in 6 language families.^[69][70] About half of the indigenous languages are no longer spoken, and all of California's living indigenous languages are endangered. There are some efforts toward language revitalization, such as for the Karuk language.

The official language of California has been English since the passage of Proposition 63 in 1986.^[71] However, many state, city, and local government agencies still continue to print official public documents in numerous languages.^[72] For example, the California Department of Motor Vehicles offers the written exam for the standard C Class driver's license in 31 languages along with English, and the audio exam in 11 languages.^[73]

Culture[link]

Saint Patrick's Day in San Francisco.

The culture of California is a Western culture and most clearly has its modern roots in the culture of the United States, but also, historically, many Hispanic influences. As a border and coastal state, Californian culture has been greatly influenced by several large immigrant populations, especially those from Latin America.^[74]

California has long been a subject of interest in the public mind and has often been promoted by its boosters as a kind of paradise. In the early 20th century, fueled by the efforts of state and local boosters, many Americans saw the Golden State as an ideal resort destination, sunny and dry all year round with easy access to the ocean and mountains. In the 1960s, popular music groups such as The Beach Boys promoted the image of Californians as laid-back, tanned beach-goers.

In terms of socio-cultural mores and national politics, Californians are perceived as more liberal than other Americans, especially those who live in the inland states. In some ways, California is the quintessential Blue State – accepting of alternative lifestyles, not uniformly religious, and preoccupied with environmental issues.

The gold rush of the 1850s is still seen as a symbol of California's economic style, which tends to generate technology, social, entertainment, and economic fads and booms and related busts.

LGBT[link]

California is considered generally liberal in its policies regarding the LGBT community, and the rights of lesbian, gay, bisexual and transgender people have received greater recognition since 1960 at both the state and municipal level. California is home to a number of gay villages such as the Castro District in San Francisco, Hillcrest in San Diego, and West Hollywood.

Through the Domestic Partnership Act of 1999, California became the first state in the United States to recognize same-sex relationships in any legal capacity. However, the status of same-sex marriage in California is unique among the other U.S. states, in that California formerly granted marriage licenses to same-sex couples, but has discontinued doing so. In 2000, voters passed Proposition 22, which restricted state recognition of marriage to opposite-sex couples. However, in May 2008, the California Supreme Court struck down the initiative in In re Marriage Cases, leading to the marriage of over 85500 same-sex couples between May and November of that year. In November of the same year, the Supreme Court ruling was overruled when voters passed Proposition 8, an amendment to the California Constitution that limited marriages to those between one man and one woman, resulting in protests and further judicial cases.

In 2011, the State Legislature passed the FAIR Education Act, making California the first state to enforce the teaching of LGBT history and social sciences in the public school curriculum, while also prohibiting educational discrimination on the basis of sexual orientation and gender identity.

Religion[link]

Mission San Diego de Alcalá, one of the first Spanish missions in California

The largest religious denominations by number of adherents as a percentage of California's population in 2008 were the Catholic Church with 31 percent; Evangelical Protestants with 18 percent; and Mainline Protestants with 14 percent. Those unaffiliated with any religion represented 21 percent of the population.^[75] The American Jewish Yearbook placed the total Jewish population of California at about 1,194,190 in 2006.^[76]