Could you please learn enough history to understand who you are talking about?

What do you think the Comanche were doing? How about the Aztecs?

Or does genocide and conquest only count if you have to travel across the Atlantic to do it?

Not to mention that Native American cultures are extraordinarily diverse and range from remarkably peaceful to incredibly savage (if we're judging them by how "genocidal" they are). "Nigeria" is also highly diverse, and the historical kingdoms there have plenty to answer for, if you're going to call for the destruction of the culture of any group that had historically in part conducted itself with grotesque cruelty.