But Nations are still the most natural way to divide people up according to language and culture.
Think of a neighborhood. Houses are the “nations”, every household, has common resources that are shared, and usually there is compatibility amongst the members of the household.
Neighbors can be of different cultures, and yet they can still be good neighbors.
Imagine, however, trying to place two families of different cultures under the same roof, where now they compete for the shared resources of the house, you can see the inevitable conflicts that will result. It’s not to say one culture is necessarily better than the other, but still, it is a less than ideal situation to put them in.
That’s why we have nations.
“It’s not to say one culture is necessarily better than the other,”. . .actually, I’d say our American culture is world’s ahead of other cultures.