late edit: DISCLAIMER: The pictured map is not actually a representation of the territories before colonisation. It's a hypothetical map of what countries there might have been had the continent not been colonised, thus all the names and borders are fictional and have never existed.
For good actual maps, check out native-land.ca.
My family (Appalachia) swears this one or that one was full Cherokee. My dna shows mostly what you’d expect. English, Irish, and Scottish. I also have 1% Nigerian dna. I figure that’s probably it. Someone was making an excuse for being a bit dark. That doesn’t explain how everyone I know is white as snow and claiming native ancestry though.
My wife shows 3% native ancestry, so her people didn’t make it up.
A lot of dna was lost to genocide though, so some can’t be tested for.