United States The United States of America ( USA ), commonly known as the United States ( U.S. ) or America , is a federal republic composed of 50 states , a federal district , five major self-governing territories , and various possessions . [fn 6] At 3.8 million square miles (9.8 million km 2 ) and with over 325 million people, the United States is the world's third- or fourth-largest country by total area [fn 7] and the third-most populous country . The capital is Washington, D.C. , and the largest city by population ...... s ee more>>>>>
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