You said this:

> we were the colony to finally collapse the system after many centuries of it being standard across the world.

That is blatantly false. That was my point. You are right the Europeans weren't angels, but you were absolutely wrong there, America was the colony that was dragged kicking and screaming to abolish slavery long after everyone else had already done so, it absolutely wasn't the colony that finally collapsed the system of slavery it was pushed by everyone else to end it and then still had to go through a civil war doing it.