The land-bridge theory has been popular for quite some time, but I doubt it. Native Americans were/are incredibly diverse, it would be strange for them to have a common ancestor group. There is evidence that native Americans were here before the land-bridge existed.
So how did they get here? Boats. The idea that they couldn’t make the boats capable of traversing the strait is rooted in old ideas of white supremacy, where every colored civilization is incredibly primitive. (Side note- this same line of thinking is why some white supremacists think aliens had to have made the pyramids).
To answer who the ancestors were, there is debate over whether they are from Siberia or west Europe. Maybe both.
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