The first humans to move into the Americas came by sea rather than over a land bridge, according to a new study, which found that a giant 3,000-foot tall wall of ice blocked their way.For a long time there have been two main theories of the way people first migrated into North America - over a land mass called Beringia that once connected with North America, or by travelling along the Pacific coast in small watercraft from Asia.Whether they travelled into North America over land depends on whether Beringia actually had an ice-free corridor, allowing travel down to the Great Plains.
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