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>there has been no form of slavery in the Western world anywhere near as brutal as American slavery

Absolutist statements like this rarely seem to hold true.[0] American slavery is European slavery as well. Europeans (both countries and individuals) benefited extremely handsomely from enslaving people in Africa and bringing them to their colonies in America. And even after they had finally outlawed slavery for themselves just a few scant decades before the US did, they kept buying that affordable slave-produced cotton and sugar and coffee and etc. from the Americas.

[0]https://en.wikipedia.org/wiki/Slavery_in_medieval_Europe