I think ethnicity is also not a good fit if thats what you are intending it to mean. But actual ethnicities and races will in any case emerge in any society ov

I think ethnicity is also not a good fit if thats what you are intending it to mean. But actual ethnicities and races will in any case emerge in any society over the centuries. And we will need another set of wars and bloodshed to relearn the lessons of ethnic/racialism being bad again.