It has become commonplace to accept that humans came to the New World from Asia across the Bering Strait. It has also become commonly accepted that the people who crossed this strait were in fact Homo sapiens sapiens (and not some earlier form of the species) and that they did not begin this migration before the terminal Pleistocene era.
These assumptions are based upon a number of aspects of the archaeological and biological record. The lack of human skeletal remains in the New World before the end of the Pleistocene sets the period before which migration seems unlikely to have occurred. The biological connections between the peoples of Asia and the native peoples of the Americas suggest that at one time these groups formed a common and united gene pool. And the fact that dental variation in the Americas is less than that in Asia…