United States — Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15, years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. On July 4,, during the course of the American Revolutionary War, the war ended in with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in , after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in and designed to guarantee many fundamental civil liberties.