[SunkenCiv]

mtDNA isn't nuclear DNA, and doesn't tell much of anything (other than possibly suggesting arrival by sea, or arrival of different waves, or much greater antiquity of humans in the Americas, or colonization from east to west, rather than west to east), simply because it is amplified as it is passed to all offspring.

[CobaltBlue]

mtDNA isn't nuclear DNA, and doesn't tell much of anything

Sorry to disagree with you, but thousands of genetic researchers, especially genetic archaeologists and genetic anthropologists, disagree with you.

If you have evidence in favor of your theory, perhaps you can enlighten the rest of us with it.