This is a great article if you are an archaeology buff!
http://www.archaeology.org/0901/topten/Excerpt concerning the first people in the Americas:
By looking at variations in the DNA between different modern-day Native Americans, the researchers determined that the first people probably arrived about 18,500 years ago. "It looks like there was a migration out of Asia into Beringia and there was a stopover for a few dozen generations," says geneticist Scott Woodward of the Sorenson Molecular Genealogy Foundation. "Then these people spread quite rapidly into the Americas.
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