Early settlers of the interior of northwestern North America would have been faced with what challenge if they attempted to migrate south:

Question

Quizplus · Accepted Answer

The coalesced Cordilleran and Laurentide ice sheets would have presented a significant physical barrier for early settlers attempting to migrate south. These ice sheets covered large parts of what is now Canada and the northern United States during the last Ice Age, making migration difficult if not impossible. Active volcanoes, massive animal extinctions, and a 1,000-year-long drought would have been challenges for early settlers, but they would not have necessarily prevented migration south.

Early Settlers of the Interior of Northwestern North America Would