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There is still disagreement on when the Bering land bridge existed. The bridge was probably exposed about 70,000 years ago and disappeared 11,000 years ago.
beringia or the bering strait
Archeologists and historians believe humans crossed over the Bering Sea land bridge about 20,000 to 30,000 years ago. It is possible that others came to the Western Hemisphere by other means.
A land bridge might have existed between the western part of North America and Asia millions of years ago before the glaciers melted and filled the area up with water. The migration of people from Asia to North America can be traced back to this era.
Scientists believed that thousands of years ago that the regions that were connected was Asia and North america.
The District of Columbia was formed from land from Virginia and Maryland.