United States
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The United States of America (USA), commonly called the United States (US or U.S.) and America, is a federation|federal republic#Type|constitutional republic consisting of U.S. state|fifty states and a Federal district#United States|federal district. The geography of the United States|geography and climate of the United States|climate of the United States is also extremely diverse and is home to a variety of species. Paleoindians Settlement of the Americas|migrated from Asia to what is now the United States mainland around 15,000 years ago. After 1500, Old World diseases introduced by Europeans greatly reduced their populations. European colonization of the Americas|European colonization began around 1600 and came mostly from England. The United States emerged from Thirteen Colonies|thirteen British colonies located along the Atlantic seaboard, which developed their own economies and democratic political systems. Disputes between Great Britain and the American colonies led to the...
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