Jews have been persecuted for a thousand years [1]! They whole reason for the Jewish diaspora was they kept getting kicked out of countries wherever they settled. Even where they were temporarily tolerated, they were still often discriminated against. Antisemitism wasn't just a Nazi thing, it was global and lasted far longer than slavery.
I know, but I was responding to the claim that "no population has gone through more stress than post-war Jews" and it being a counterexample to American slavery. It's a difficult thing to compare as it's essentially an apples-to-oranges comparison.
[1] https://en.wikipedia.org/wiki/History_of_the_Jews_in_Germany