[Partisan Gunslinger]

You are comparing apples to oranges. Those people in America are not starting from a pre-flood genome and then adapting, so the starting point is different, and the changes that would need to occur in the genome are also different. We also have plenty of interbreeding in America to muddy the waters, so I doubt any such subtle changes over time would be easily distinguishable from the effects of interbreeding on the population.

I would think interbreeding would hasten everyone to be more similar. That has not happened to a great degree.

[Boogieman]

“I would think interbreeding would hasten everyone to be more similar. That has not happened to a great degree.”

Says who? Black Americans are easily observed to be several shades lighter, generally, than black Africans. I’m sure if anyone bothered to do a scientific analysis, they could find other similar changes due to interbreeding.