The United States of America, also known as the United States or America, is a country located primarily in North America. It is a federal republic of 50 states and the federal capital district of Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the state of Alaska forming a semi-exclave in the northwe…The United States of America, also known as the United States or America, is a country located primarily in North America. It is a federal republic of 50 states and the federal capital district of Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the state of Alaska forming a semi-exclave in the northwest and the state of Hawaii spanning an archipelago in Oceania. Indian country includes 574 federally recognized tribes and 326 Indian reservations with tribal sovereignty rights. The U.S. asserts sovereignty over five major island territories and various uninhabited islands in the Pacific Ocean and the Caribbean. It is one of only 17 ecologically megadiverse countries, with the world's third-largest land area and third-largest population, exceeding 340 million.
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