a country built upon colonization, Genocide and slavery
Which country wasn't?
Probably the two most unusual things about the US are that instead of either absorbing and assimilating, killing off, or enslaving the natives we mostly relocated them and that we imported most of our slaves from overseas instead of primarily enslaving the conquered people(s). I mean those, and we're one of the later examples of all of it in history.
America is an outlier. Concentration camps and intentional shipping Europeans overseas with the intention to colonize an 'unpopulated land (see "thinking the Natives weren't human")
Adolf Hitler was literally inspired by how America wiped out all the brown natives and replaced them with the white Ubermensch.