I recall dating a young lady in college who was full-blooded Sioux Indian. She repeatedly told me that the Sioux were not related to other Indian tribes, and were in her words “genetically Caucasian.”
Being more concerned with the fact that she was quite good-looking and a lot of fun to be with, I paid very little mind to the veracity of her genetic claims - they made no difference to me.
I wonder now if her story had some truth to it.
I don’t know. Could have been a Post-Columbian result.
http://www.bbc.co.uk/dna/h2g2/A850006
http://www.dnatribes.com/?gclid=CKD4jfCkxpQCFQKaFQodkAnakg
The Lakota Originally moved out onto the plains from the eastern areas of Minnesota and possibly more eastern than than that if traced to their true origins. This might also shed some light on the physical differences between the eastern and western tribes and could also account for the language separations.
A through genetic study of of tribes across the nation could lead to a genome mapping and possible migration trail of the tribes. It would interesting to see where the outfall of asian and european influences occur.