Every country oppressed people of color, until they didn't. We stopped. The north did a long time ago, long before most of the civilized world, so half of the country is basically blameless. Eventually the slaves were freed and all we're made equal as intended. It is not the system keeping people down anymore just broken mindsets sold by the left for job security. Let's also not forget that slavery is still very real and prevalent and most countries aren't as successful and affluent as ours, though you forget it while living in your rent supported house, eating your government cheese and typing on your slave labor phone.
Now CRT isn't history. It's a bullshit narrative trying to paint blacks as losers and victims of the evil American traditions. Now anyone could make up some batshit theories but when it's clearly Marxist indoctrination meant to make people hate their own country and capitalism and law and order etc... there is no need for that suicidal trash to be taught. It's no different than teaching white supremacy theory as fact. I would hope that would bother you.