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A large landmass emerges in the region between modern day Alaska and Russia when a large quantity of water is locked up in the polar ice caps.
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For a long time it was thought that people migrated across the land bridge exposed in the pre-history era. However, it was later discovered that people lived ON the bridge for several thousand years.
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Scientists believe that once the glaciers began to melt, a corridor opened up in the interior. This allowed the people to migrate south into the rest of North America.
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An abrupt rise in the sea levels caused by the melting of the glaciers caused the migrants to be cut off from Asia and there was no migrating back. Beringia was covered by the ocean.
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Scientists in the 20th century discovered arrowheads and spear tips in the pueblos of New Mexico that dated back to 11500 BC and resembled similar ones found in Alaska, further strengthening the land bridge and inland migration theory.
