[Freedom4US]

In North America, it was for all practical purposes, empty of people, there were of course millions of Buffalo and myriad other species of woodland and plains critters but there is virtually no traces of human settlements to any great degree. There just aren't. That is one of the remarkable aspects of the "Old" world versus "New". Whole civilizations and dynasties rose and fell over thousands of years while the NA continent remained unsuitable for human habitation. A mile of ice tends to limit agriculture! Ice Ages suck, one reason why the entire "global warming" scam is particularly egregious.

[PIF]

In North America, it was for all practical purposes, empty of people

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Teepees leave little evidence after generations of farmers plowed their field, not to mention the continent-wide firestorms that raged for 100 years during the comet strikes in 10800 BC.

The ice never got far past the Canada-US border. So was lots of opportunities to hunt and plant crops. The whole "NA continent remained unsuitable for human habitation" is just not true.