Well, I've got a box full of photographs of my ancestors from before 1900, some of them French, some German, and some Native Americans -- who look very Asian to me.
I've got census records going back a couple of centuries and old letters that give me the history of my Chippewa ancestors, the ones that intermarried with the French Canadians, the ones that lived on Turtle Mountain, the ones that went to Indian Schools, the ones that had names I can't even pronounce.
I've got my own mtDNA, that's Haplogroup A2.
All of which tell me that some of my own ancestors walked over Berengia from Siberia, and looked more like Mongols than Kenniwick Man.
With all the DNA work that's going on, we'll likely have a believeable answer within the next ten years. I hope I live long enough to see it, lol.