Excellent point, @vertigo7, and it has for a cenrtury been the main hypothesis for how humans got to the Americas via Siberia.
Today - and with genetics at hand - that is all an ongoing discussion, with the 'classical' view setting the so-called Clovis culture as evidence for early human presence in the Americas, but they were already far south. All in all, the dates of find sites (some of the older ones vigorously disputed) and their geographical distribution doesn't quite fit the sea level fluctuations and climatic sequence at the end of the last glaciation and the early holocene.
https://advances.sciencemag.org/content/4/8/eaat5473
And genetics as additional evidence paints a much more varied image. It probably wasn't only via the north, but also over the sea that humans reached America.
Recently (a year or 2 ago) I read a paper proposing that hunter gatherer groups didn't just use a continous land bridge, but hopped the islands. It was based on a find site on an Alaskan island, stone tool ensembles dating to 17,000 BP.
Apart from that, another find site called Chiquihuite Cave was claimed to document a human presence even 26.000 years ago, but that is
heavily disputed (experts only
) and the evidence too weak for certainty. Extraordinary claims need extraordinary evidence and all that
I am not an expert in American prehistory, only following the news from time to time, but I'd generally colour me a hobby pre-historian
.