USA

The United States of America (USA or U.S.A.), commonly known as the United States (US or U.S.) or America, is a country primarily located in North America, between Canada and Mexico. It is a liberal democracy and republic of 50 federated states, a federal capital district (Washington, D.C.), and 326 Indian reservations that overlap with state boundaries. Outside the union of states, it asserts sovereignty over five major unincorporated island territories and various uninhabited islands. The country has the world's third-largest land area, largest maritime exclusive economic zone, and the third-largest population (over 334 million).  The federal government uses a presidential system with three separate branches: legislative, executive, and judicial. American territory was first settled by Paleo-Indians who migrated across the Bering land bridge over 12,000 years ago. Colonization by the British began in 1607. Thirteen colonies eventually rebelled against the British Crown over taxation and political representation, declaring independence on July 4, 1776. Their victory in the American Revolutionary War (1775–83) resulted in a confederation of states before the U.S. Constitution and Bill...