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And my point is that it has some controversy around it as to when and how and why it happened.
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"Some controversy" is putting it mildly-- there are as many hypotheses as there are researchers, placing the original North American colonizers all over the map, plus several mutually contradictory genetic studies. Claims of "pre-Clovis" sites have been
cropping up for decades, always to be widely disputed by other researchers. There is one site here in my home state of
South Carolina. So far, nobody has come up with an uncontested, undisputed pre-Clovis site-- it'll be years yet before the jury is in on the latest claims.
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Originally Posted by kennyc
And it's irrelevant if it was a narrow or wide "land-bridge"
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I can't agree with that. You can't tell me that migration across, say, Panama from North America to South America is not different from migration across a passage thousands of miles wide.