3 waves of settlers settled the Americas.

[bjh]

Originally Posted by CAVA1990

I'm guessing that's because the Eastern tribes were more likely to have mixed with non-Indians over the more years they were in contact. Most Western tribes were pretty isolated until a couple of decades or more into the 19th century.

I agree. To this day the general population density is much higher in the eastern states. That's made a big difference over the last 300 years.