When people are free to associate as they please, we can’t be surprised if they sometimes self-segregate. People self-sort along many affinities, including ethnic affinities. This is what lawyers call de facto segregation, and it’s none of the law’s business. De jure segregation — segregation imposed by law, including segregation promoted by public policy — is, on the other hand, very much the law’s business.
In 1866, Congress passed a Civil Rights Act (the 1866 CRA) asserting the equal rights of blacks before the law, including property rights, and real-estate rights in particular. The 1866 CRA warned
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