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The United States of America, also known as the United States, the U.S., the U.S.A., and America, is a country in North America. A federal republic, the United States shares borders with Canada and Mexico, and extends from the Atlantic Ocean to the Pacific Ocean.The United States is also in close proximity to Russia via the state of Alaska; separated only by the Bering Strait. Its capital is Washington, D.C.

The present-day continental United States has been inhabited for at least 15,000 years by indigenous tribes.[1] After European exploration and settlement in the 16th century, the English established their own colonies, and gained control of others that had been begun by other European nations, in the eastern portion of the continent in the 17th and early 18th centuries. On 4 July 1776, at war with Britain over fair governance, thirteen of these colonies declared their independence; in 1783, the war ended in British acceptance of the new nation. Since then, the country