The abolitionist movement was huge in the North, where economic equality was better [0]. The antebellum South was a great example of a deeply unequal society, where poor whites were easily pitted against blacks. (Still haven't solved this problem)
>Or you could look at the contemporary US. We have basically no unemployment, enormous wealth, no war on our land
Huge wealth inequality. Student debt crisis. Opioid crisis. Healthcare. Good jobs gone, replaced with bad jobs. Labor participation rate hasn’t recovered since the Great Recession.
>Maybe let's flip it, do you have examples of peaceful high-well-being societies where people who were different from most people in the society were equivalent participants in that well being?
Sure, though I did only say better, not "equivalent": we can look at Jews who prospered in Polish-Lithuanian Commonwealth [1][2], or Jews in England during the Victorian Era [3]. As contrasted with Jews in Western Europe during the Dark Ages -- _lots_ of pogroms and expulsions -- or Jews in Weimar Germany, or Jews in Tsarist Russia.
[0] https://en.wikipedia.org/wiki/Antebellum_South#Wealth_inequa...
[1] https://en.wikipedia.org/wiki/History_of_the_Jews_in_Poland_...
[2] https://en.wikipedia.org/wiki/History_of_the_Jews_in_Poland#...
[3] https://en.wikipedia.org/wiki/History_of_the_Jews_in_England...