It is likely that humans wiped out the mammoth on both sides of the ocean with about the same level of weapons. Now we have better tools to wipe out things, but sometimes we stay our hand. Probably because we can better afford to. The Indian loved every living thing. As long as it was edible.
Indian corn has four colors, they stand for North, South, East, and West.
The Indian does not sell the land he walks on. Of course the Indian did not buy land from his neighbors. He fought and killed and died for it. If he could get iron arrow heads or firearms to help him out, so much the better. Indians made treaties too, but they seldom lasted longer than was convenient.