

its because slavery.
early u.s. was created on the notion that black people werent people. when those that made money on that being fact were forced to think otherwise, it almost ripped the country in half.
that animosity… the desire for non whites to be considered not people did not just suddenly vanish. its festered in america. it is ingrained. it is the ‘southern heritage’ talked about in whispers (and now out loud) with the new fascist takeover of america.
a full 50% of america still hates the fact that non-whites are treated as people.
i would guess size and population densities, and government stabilization. what country is ‘south america’ ?
theres more people in a larger area in a much more stable form of government allowing those socio-economic realities to exist far longer.
ie the united states is super racist.