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The first inhabitants of the Americas (Paleo-Indians) are thought to have crossed an arctic land bridge from Siberia, that existed during glacial periods of the Late Pleistocene Age, as early as 45,000 years or as little as 13,000 years ago. At the time, much of Siberia was a warmer steppe climate.

Later, glacial melting raised sea levels and covered this path with the Bering Strait.

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