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The Bering Strait between Siberia and Alaska became dry land because of the last Ice Ace which caused much of the ocean water being locked up in giant ice fields, lowering the sea level considerably and turning the Bering Strait sea floor into dry land. At the end of the Ice Age the ice melted, the sea level rose again and Bering Strait once again became a sea.

Up to that last Ice Age, the Americas were practically or even totally uninhabited by humans. Once the Bering Strait dried up and the climate of Siberia became too cold for humans to sustain, a trek started from Siberia to northern America, and from there, ever farther south.

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9y ago

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