I read some pretty convincing studies saying some mummies that were found in Florida had European characteristics a few thousand years ago. It's not crazy to think a few Europeans ended up in the Americas and died out from famine or war or something.
Discussion
they were likely outposts of the civilization before the flood . the ancient legends down south often speak of tall white bearded gods who appeared and taught building and agriculture... they then ruled these new areas and peoples ... sometime later , pre or post-flood , they simply were absorbed into the local populations.
millennia later , when the spanish arrived , they were able to gain access and more than likely some reverence by virtue of these legends... the Spanish even wrote about and drew illustrations of the then contemporary Incan rulers having a lighter skin tone and greater height, i.e. remnants of the white blood from prehistory, than the masses they ruled...
Interesting thoughts. I've read Europeans had pretty dark skin 6k plus years ago. And that light skin was likely an adaptation to farming where the diet had much less vitamin D. ( meat has a good bit). For example, some Asians have pretty white skin and seemed to lighten up from farming similarly.
Anyway, any light skinned people would likely have developed farming