Sound alike the gymnastics to define racial categories to preserve a social hierarchy as well. What is white? Well it's people from here and here, not Irish, not Jewish, etc. Oh wait, Irish are allowed now but not Okies. Okay, they're allowed now but no Jews! Now, Jewish can be allowed sometimes but no Italians. Alright, Italians, but no Jews, Irish are also okay, some Hispanic people if they can pass, certain Asians can be let in, etc. Etc. It always go on like that. It stays malleable just to make it exclusive.