States can have different aims of the structuie their peoples should have. Liberal capitalist states currently state that they ignore ethnicity in the makeup of their peoples, as long as they can help the nation in the international competition.
Nazi-Germany had a strong focus on having some sort of ethnic monoculture in the makeup of the German people.
Israel strait up states that it doesn't value arabic lives and favours ashkenazi jews. They claim to be "the one jewish state" and actively draw jewish people to settle there.