Interesting. I have read that Spaniards encountered white people in South America, they had red hair and light skin. I would not be surprised if Indians were actually White. Many of those Indians I have seen look Caucasian based on facial features. I know Mayans, Mapuches, and Incas have the same rate of Rh negative blood as Basques and Celts. It would not surprise me if they are related to them.
The Blackfeet Indians also have that Rh Negative blood. I have heard they called themselves “the blood”. I am a blood-brother of them.