I was recently wondering that since in the US the race is declarative and such a big thing, why don't people self declare being <of the currently most interesting race>?

If this brings you points at entey exams or similar bonuses - why not (mis)using that mechanism?

Or maybe I have as a European the wrong impression about positive discrimination based on race in universities? (I do not nit jave recent data, just remember that people mentioned that they did not play the "race card" to be admitted)