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People that suffered in OTL that you don't want to suffer in your TL's
for me:
1.Luzon lowlanders(the people of lowland luzon before the spanish came, who were decimated during the time of the Spanish)
2.Silesian Poles(not the ones that resettled to Silesia)
3.Kosovo Serbs
Kosovo Serbs and Silesian Poles suffered similar fate in OTL and a majority of Silesian Poles are not even in Silesia right now a majority of them are either in Texas or other parts of Poland where they resettled like in Poznan or Germanized.
4.Circassians
5.Armenians