War is a defining trait of humans. No matter where you go or when you go it's always someone wanting to wipe this group out or that group out whether it's for economic reasons or cultural reasons or religious reasons or just good old fashioned hatred.

Sure, the various tribes had to defend their territories from others and they had definite opinions about their opponents but this was small potatoes compared to a Govt with an unofficial policy to wipe all of the natives out and a citizenry who thought they were just savages.

In the US "schools" were established to force natives to become whites. In many cases the Indian was beaten out of them. These schools were either run by religious groups or the govt itself. As in Canada we are finding unmarked graves at the sites of these schools with who knows how many bodies.