Since the "Civil Rights Cases" many states have passed legislation proscribing discrimination in various areas, including public accommodations, employment, and housing. The courts have coped with various arguments, both ingenious and ingenuous, attacking the validity of State "Fair Practices" Acts, but generally have sustained the legislation.
The Permissive Area of State Anti-Discrimination Acts,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol1/iss1/8