The other stuff aside, the root cause of American white supremacy, which is neither uniform nor evenly distributed, is British colonial policy. As this has never been addressed, and was made worse by the failure to utterly obliterate the Confederacy and its slavery-treasonists, the affliction has slowly spread outward as the Lost Cause, States-Rights, an apocalyptic gun-fetishizing sectarianism, backstab myths and garbage theologies and cargo cults like the sovereign citizens movements and Trumpian fascism.
Should have hung every Confederate officer, officeholder, foreman, plantation owner and slave patroler by the neck until dead. And then dumped their treasonous corpses into the Gulf of Mexico to feed the fishes. Should have done the same for every Copperhead and Kansas Border Ruffian, too.
Sure it does. Italy is filled with racists, but they don’t have as foundational to everything British colonial policy and British-created race divisions.
When Italians (as Italians) did civil war, it was over economic systems and the abolition of aristocracy, not over whether God was cool with buying and selling people, who, being slaves, were therefore not persons, and not of the same order or value.
You can still dig them up and burn what remains are left. Or you could do what all non-western countries do and get on with your life and realize the past is the past which no one as of yet has invented a way to go back and change what happened.
This shame game is purely on one side and only in certain western countries the majority of the world doesn’t want any part of it. Go and lectureTurkey on Armenian genocide and see what happens.