I seen that as well on the History channel ages ago.
There was a Tribe in Southern France with an unique method of creating spearheads. Around 300-400 later, the same design appeared in America. Due to the climate at the time and how you can cross the altantic, they believed they followed game across the frozen sheets of the North Atlantic and settled in America.
But there is also the fact the Mongolians also went to America, crossing at Russia-Alaska, so hence why some native American population shares genes from Asian populations.
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