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Some scholars believe that between nine and fifteen thousand years ago , a land bridge existed between Asia and North America that we now call Beringia . The first inhabitants of what would be named the Americas migrated across this bridge in search of food . When the glaciers melted , water engulfed Beringia , and the Bering Strait was formed . Later settlers came by boat across the narrow strait . -LRB- The fact that Asians and American Indians share genetic markers on a Y chromosome lends credibility to this migration theory . -RRB-
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