[Cowboy Bob]

Who were the hunters - American Indians, who crossed the “land bridge” from Siberia to Alaska...or someone else?

[Theoria]

Stanford and Bradley have a pov, that 'peoples' came from Europe. Dunno if DNA has helped them out on this one, or simply that lineage didn't make into the tested samples.

America 'discovered by Stone Age hunters from Europe'

See: Solutrean hypothesis