[Cronos]

The fact that the “oldest city in the Americas” is in South America seems to lend credence to the theory that the PaleoIndians used boats to travel down the west coast rather than trudging on foot.

I don't think so.

A city i.e. settlement would be formed when

1. there is a religious reason OR
2. There is farmland/animal husbandry areas nearby and people want to band together OR
3. both

AFAIK, north America was more amenable to hunter-gatherers so less need for cities until later, right?

But the boat travel from N to S makes sense

[SunkenCiv]

There are those from N American tribes who claim they didn’t come from anywhere, that their ancesters were 100% native. Wouldn’t an American origin for the world’s people throw a great big bedpan in a lot of faces? :^) Something amusing to contemplate anyway.

The Americas weren’t peopled in one go, landlubbers should not be writing history books.