[throwaway894345]

> What is German? What is Jew? What is "country"? And what is nation?

I agree about ethnicities being mercurial; I'm not espousing "ethnicity" as a good way of organizing the world, but it's an established convention. WRT "country", here I mean it in a political/territorial sense--i.e., a territory under control of a sovereign government.

> Also, I'm super suspicious of anybody who says about any topic "it's always been this way" or "it's just common sense"

I'm not asserting anything. Ethnicity seems much too mercurial for me to understand well, and it seems like it's easy for people on either side of an argument to flex the definition to suit their ideological ends.