For better or worse, today’s social morality has come to mean that you are not discriminated against for the broad circumstances of your birth (race, creed, community, sex, orientation) but can be discriminated against for the very specific circumstances — how wealthy your parents are, how good your personal genes are in making you smart or athletic etc.

But nationality, either that of your birth site or your parents, seems like a broad circumstance, similar to race, not a specific one. Races actually don’t truly exist. They are loose collections of characteristics developed among geographic groups that didn’t do much interbreeding with other groups for long enough to develop certain traits based largely on sexual selection, though in some cases, like melanin, environment. They are certainly not more arbitrary than nationalities.