Capital Washington, D.C.
Largest city New York City
National language English
Government Federal presidential constitutional republic
President Barack Obama
Vice President Joe Biden
Upper House Senate
Lower House House of Representatives
Area Total 9,826,675 km2 or 3,794,101 sq mi
Population 2010 census 308,745,538
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.
The United States has operated under a two-party system for most of its history.Since the general election of 1856, the major parties have been the Democratic Party, founded in 1824, and the Republican Party, founded in 1854.
In the 114th United States Congress, both the House of Representatives and the Senate are controlled by the Republican Party. The Senate currently consists of 54 Republicans, and 44 Democrats with two independents who caucus with the Democrats; the House consists of 246 Republicans and 188 Democrats, with one vacancy.There are 29 Republican and 21 Democratic state governors.