Who would we be rounding up and gassing? Mexicans? I know you were just spitballing, but the idea that the US could or would mirror what the Nazis did is absurd.
We didn't have to use gas to kill 99% of the Native Americans who were here.Indeed...because we didn't kill 99%...disease killed the vast majority of them...and it was nowhere near 99% anyway. I'm not even sure where you got that number (possibly your ass?). But yes, we, for the most part, treated the natives here horribly. Just like Canadians, Australians, New Zealanders, Arabs, and pretty much anybody else that ever moved to a new place in mass. It doesn't make it right, it's not an excuse, our ancestors did them wrong and we should feel bad for it, remember it and try not to do it again.