Oh no that's new. Back when the genocide was in a more active phase and there were "Indian Wars" they were very explicit about it.

But today, you're right, they just teach a few key atrocities and handwave the other hundred million. I must have misread lol

I think that's just the different stages of settler-colonial development.

Go back far enough and everyone is where they are because their ancestors killed whomever was there first. Not that it justifies anything, but it's genocides all the way down. Even native Americans wiped out a prior civilization if you go back far enough.