Recently a newsfeed article proclaimed that evidence had been found that pushed back human occupation beyond the standard 10,000-12,000 years noted in most textbooks. I wanted to comment, old news, but
South America, which you might assume, using the Beran Strait model would have been settled last, has some occupation sites going back past 40,000 (one even thought to date to 80,000).
North American sites, in Alaska, Pacific NW and California shore, have regularly produced 10,000-11,000 dates, with a few being redated via new testing to as much as 16,000. But if they came over the strait and then trickled down into central and south America....shouldn't these sites be older?
What some have theorized for decades is finally being accepted my mainstream science and that is that there was no single migration that populated the Americas. Instead, there were waves of migration that brought people to the Americas.
There was not one route via the Strait, but many stopping off places as migrating people using very efficient craft followed the coast lines southward. Instead evidence of this has been found in South America with a pottery made precisely the way a pottery was made in ancient northern Japan.
Other evidence showing there was a more common south to north migration is found in the early mound building cultures of the American southeast (from Oklahoma to Georgia and Illnois to Alabama). The art, artifacts, and construction of these community centers show clear links to Meso-America.