The relevant piece of legislation is not state-by-state but the Civil Rights Act of 1965. It defines protected classes, and it defines them as attributes that y

The relevant piece of legislation is not state-by-state but the Civil Rights Act of 1965. It defines protected classes, and it defines them as attributes that you cannot discriminate along, not groups; whites and blacks are (de jure, not necessarily de facto) equally protected by race's status as a protected class.