I read that Mayans, Incas, and Mapuches had the same rate of Rh negative blood as Celtic and Basques, which leads to the possibility they are from Europe.
Lacandon Maya
This website had a picture gallery of them and some have blonde and red hair. I've seen photos of Mapuches of South America and they look more Caucasian to me. Anazasi relics look very Celtic to me.
Ancient America
