- published: 30 Jan 2015
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The United States Congress is the bicameral legislature of the federal government of the United States, consisting of the Senate, its upper house, and the House of Representatives, its lower house. Congress meets in the Capitol in Washington, D.C.
Both representatives and senators are chosen through direct election. There are 535 voting Members of Congress; the House of Representatives has a membership of 435 and the Senate has a membership 100. Members of the House of Representatives serve two-year terms representing the people of a district. Congressional districts are apportioned to states by population using the United States Census results, each state in the union having at least one representative in the Congress. Regardless of population, each of the 50 states has two senators; the 100 senators each serve a six-year term. The terms are staggered so every two years approximately one-third of the Senate is up for election. Most incumbents seek re-election, and their historical likelihood of winning subsequent elections exceeds 90 percent.
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. 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). Per capita income is the world's sixth-highest.