The United States of America , commonly known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles , the United States is the world's third- or fourth-largest country by total area and slightly smaller than the entire continent of Europe's 3.9 million square miles . With a population of over 325 million people, the U.S. is the third most populous country. The capital is Washington, D.C., and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America be...
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