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The United States of America is a large country in North America, often referred to as the "USA," the "U.S.," the "United States," "America," or simply "the States." It has a land area of about 9.6 million km2 (about half the size of Russia and about the same size as China). It also has the world's third-largest population, with more than 320 million people. Representing the world's single largest economy with its history of mass immigration dating from the 17th century, it is a "melting pot" of cultures from around the world.