"It comes very close a lot of the time" doesn't imply the fit is perfect, so minorities are to be expected. And your implication that before WWI, different eth

"It comes very close a lot of the time" doesn't imply the fit is perfect, so minorities are to be expected. And your implication that before WWI, different ethnic groups coexisting peacefully in shared states was the norm, couldn't be more wrong. Even in antiquity, there's examples of one ethnic group banding together to vanquish another, such as the ancient Hebrew genocides of Amalekites [1] and Canaanites [2]. [1] https://en.wikipedia.org/wiki/Amalek#Amalekites_in_the_Hebrew_Bible https://en.wikipedia.org/wiki/Amalek#Amalekites_in_the_Hebre... [2] https://en.wikipedia.org/wiki/Canaan#Hebrew_Bible https://en.wikipedia.org/wiki/Canaan#Hebrew_Bible