How is discrimination along racial grounds legal in university admissions? Isn't race a protected class you can't discriminate against? If a store refused to pr

How is discrimination along racial grounds legal in university admissions? Isn't race a protected class you can't discriminate against? If a store refused to provide service to an Asian because they already had too many Asian customers, surely that would be discriminatory and illegal, I don't see how that is any different, unless Harvard requires diversity to function properly.