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History of the U.S.
Prehistory
Pre-Columbian Era

Colonial America (1492-1763)

Revolutionary Period (1764-1789)

The New Nation (1790-1828)

Western Expansion & Reform (1829-1859)

Civil War (1860-1865)

Reconstruction (1866-1877)

Gilded Age (1878-1889)

Progressive Era (1890-1913)

Great War & Jazz Age (1914-1928)

Depression & WWII (1929-1945)

Modern Era (1946 - present)

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Settlement of the Americas

Trivia powered by Prof. WalterAsian nomads are thought to have entered the Americas via the Bering Land Bridge (Beringia), now the Bering Strait and possibly along the coast. Genetic evidence found in Amerindians' maternally inherited mitochondrial DNA (mtDNA) supports the theory of multiple genetic populations migrating from Asia. Over the course of millennia, Paleo-Indians spread throughout North and South America. Exactly when the first group of people migrate into the Americas is the subject of much debate. One of the earliest identifiable cultures is the Clovis culture, with sites dating from some 13,000 years ago. However, older sites dating back to 20,000 years ago have been claimed. Some genetic studies estimate the colonization of the Americas dates from between 40,000 to 13,000 years ago. The chronology of migration models is currently divided into two general approaches. The first is the short chronology theory with the first movement beyond Alaska into the New World occurring no earlier than 14,00017,000 years ago, followed by successive waves of immigrants. The second belief is the long chronology theory, which proposes that the first group of people entered the hemisphere at a much earlier date, possibly 50,00040,000 years ago or earlier.

Artifacts have been found in both North and South America which have been dated to 14,000 BP, and humans are thought to have reached Cape Horn at the southern tip of South America by this time. The Inuit and related peoples arrive separately and at a much later date, probably during the first millennium CE, moving across the ice from Siberia into Alaska.

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