What could that mean? Europeans peopled the Americas at that early date? How?
European DNA Found In 7-8,000 Year Old Skeletons In Florida (Windover)
They probably came here by ship.
There are rumors of Egyptian artifacts in the Grand Canyon, specifically in some caves located in a mountain called Isis Temple. There are rumors that Roman weapons, armor, and other goods have been found around Tucson, though I have only read this somewhere and haven't yet found the article itself.
I think we tend to short-change ancient peoples. I believe they were a lot more advanced than we give them credit for.
Yhwhsman