History of the United States

The first residents of what is now the United States emigrated from Asia over 15,000 years ago by crossing Beringia into what is now present-day Alaska then headed south. Archaeological evidence of these people, the ancestors of the Native Americans, dates back to 14,000 years ago, although there is evidence to support an earlier date for a human population in North America.[1]

Christopher Columbus was being the first European to land in the territory of what is now the United States when he arrived in Puerto Rico in 1493. Numerous explorers and sailors were to follow; they left behind deadly new diseases (such as smallpox and measles) that decimated the Indians before the settlers arrived around 1600, the start of the colonial history of the United States. The Thirteen English colonies that would become the original US states were founded along the east coast beginning in 1607. Spain founded important settlements in New Mexico and California that became part of the U.S., as did to a lesser extent France and the Netherlands.

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