Then the genomic revolution suggested: all Native Americans share a single founding ancestry, but that founding ancestry was itself structured in ways that left different genetic traces in different descendant populations.

And now: within that founding ancestry, there appears to be a specific signal of affinity to Australasian populations that is distributed unevenly across the Americas and whose explanation involves deep ancestral structure in Asia before the American dispersal.

Each revision has not overturned the previous understanding so much as deepened and complicated it.

The Americas were populated from Asia — this remains true, and no evidence challenges it.

The founding population crossed through Beringia — this remains the best-supported model, and no alternative migration route has credible genetic support.