Constitutional Law II
The U.S. Constitution does not prevent private racial discrimination, so neither state nor the federal governments have a duty to outlaw it.
States can outlaw private discrimination under their police powers however, and the federal government can under the commerce clause.
States can enforce private racially restrictive covenants of the sale of property, but they do not have to.
- (Actually, they cannot enforce such things because of the state action doctrine.)
States can generally repeal anti-discrimination laws, but they may not be able to if it is seen as intending to authorize racial discrimination.