Dunno why you're getting downvoted.
Europe has definitely done a lot of horrible things around the world. Britain for example banned/killed of the textile industry in India (which at one time was 25% of the worlds production) to monopolize that industry at home (which is also why they imported cotton from the America's). Let's also not forget that the Confederates were white, European, colonial Settlers.
It's not just cotton buying, but the whole system / Trade Triangle around Slavery that was created by Europeans and that lead to those crimes
What, to the American slave, is your 4th of July? I answer: a day that reveals to him, more than all other days in the year, the gross injustice and cruelty to which he is the constant victim. To him, your celebration is a sham; your boasted liberty, an unholy license; your national greatness, swelling vanity; your sounds of rejoicing are empty and heartless; your denunciations of tyrants, brass fronted impudence; your shouts of liberty and equality, hollow mockery; your prayers and hymns, your sermons and thanksgivings, with all your religious parade, and solemnity, are, to him, mere bombast, fraud, deception, impiety, and hypocrisy—a thin veil to cover up crimes which would disgrace a nation of savages. There is not a nation on the earth guilty of practices, more shocking and bloody, than are the people of these United States, at this very hour.
It's from the 1800s, when the US was the global capital of chattel slavery.
The Nazis were inspired by the US, by the way. The concentration camps were inspired by the reservation system. There were holocausts in the Americas before Hitler was even born.
It's not only well documented that the American treatment of Black and Indigenous people directly inspired Hitler, but also, segregation and Jim Crow (both direct inspiration) in the US ended over 20 years after the holocaust, and slavery is still legal in the form of the prison industrial complex, which is a white supremacist institution that disproportionately harms already marginalised populations.
I am a decedent of holocaust survivors, this isn't to make light of it, it's a statement on just how bad the US is.
E: it's late and I didn't notice that queermunist had basically said the same until after I replied, but I'm leaving it, because the point is worth making again.
Specifically calculated to limit the exploit of population cramming the American South could do with slaves. The South wanted them to be counted as full people (only for the purposes of determining representatives).