Paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago,[25] with European colonization beginning in the 16th century.
The United States is a highly developed country, with the world's largest economy by nominal and real GDP. The United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, and a permanent member of the United Nations Security Council.
For other uses, see America (disambiguation), US (disambiguation), USA (disambiguation), and United States (disambiguation). Numerous disputes between Great Britain and the colonies in the aftermath of the Seven Years War led to the American Revolution, which began in 1775.

On July 4, 1776, as the colonies were fighting Great Britain in the American Revolutionary War, delegates from the 13 colonies unanimously adopted the Declaration of Independence. The war ended in 1783 with recognition of the independence of the United States by Great Britain, and was the first successful war of independence against a European colonial empire.[26] The current constitution was adopted in 1788, after the Articles of Confederation, adopted in 1781, were felt to have provided inadequate federal powers. The first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties.

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