Basically every European country has as much or more blood on their hands with racism and slavery. The UK, France, Belgium, etc. invaded countries, enslaved the populace, sold millions of them around the world, impressed them into colonies (black people aren't native to Brazil or the Caribbean), etc.
To the extent the US is unique that's down to the fact that it couldn't just wash its hands of the wreckage this caused like the Europeans could. Even then the US isn't unique because Brazil has a history of slavery going until 1888, and huge issues of racism and race-based inequality. To say the US is exclusively villainous in this respect just shows how deeply ignorant you are of anything outside your county.