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Last ice age has a bearing in settling the people, who were on the move all through, perhaps by the relentless cold climate & they looking for warm corners on the horizon to move to. 10,500 BC seems to be a good bet as the Bering isthmus started turning to Bering strait with inundation of the sea at the end of this mini-ice age.

8,000 BC seems too close by. The people started settling down a couple millennia after for raising civilisations.

I think the glaciers were retreating by 10,500 BC, which would have meant that there must have been a lot of native Americans already living in Canada & the US by then.

Actually where I live was created by the outwash of the latest glacier. The North shore is all rocky & hilly while the south shore is flat and sandy. The center was eastern prairie (now its all shopping malls).

It is arguable that the las tIce Age is only now finishing. There have been 'little ice ages', in Northern Europe at least, within recorded history, within the last 500 years. Until the beginning of the 19th century, for example, Frost Fairs were regular winter occurrences in England, held when the River Thames froze over.

In North America the last glacier ended 10,000 years ago. The remaining remnants are the Great Lakes. They are half the size they were when the last glacier began to recede.

"The earth is currently in an interglacial, and the last glacial period ended about 10,000 years ago. All that remains of the continental ice sheets are the Greenland and Antarctic ice sheets and smaller glaciers such as on Baffin Island."