"Some recent skeleton discoveries in the US have put some doubt that the south American population came via north America"
They could have come via south America or even Antarctica! Could Easter Island have provided the base for incursions from Melanesia (?). Are those the ones where some pre-Clovis/Clovis-related skeletons were involved? I am sure that the native Americans are so different because of different migrations at different times and from different places, even all Asian. The dates keep being pushed back probably because of that.
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