Archaeological finds in the Americas show ancient human immigration from both Europe and Asia into both coasts of the Americas. The oldest finds (about 13,000 years) are of Asian descent and are along the West coast of the Americas, but then those inhabitants, based on fossil records, appear to have died out. This of course shows continued support for the pre-Adam existence of humans.
A fairly recent archaeological find at the Windover site in Florida shows that Europeans had inhabited the site for many generations as recently as about 6,990 years ago (C14), but they died out. This population likely immigrated to the Americas from across the Atlantic- almost certainly in boats (as opposed to walking across the frozen Arctic). This is of course evidence of advanced boating skills even before Noah‘s time and serves as support for a technology gap after the flood event.
Later, after the flood, what would become the American Indians immigrated across the Bering Strait and again repopulated the Americas. They brought with them a rudimentary flood story. This is consistent with the worldwide flood of Noah.
Now that the flood is squarely in the realm of plausibility, if religion will allow them, scientists will rapidly discover the details of the event.
Windover Site photo by Roy Klotz MD