Racial segregation follows two forms. "De jure" segregation mandated the separation of races by law, and was the form imposed by slave codes before the Civil War and by Black Codes and Jim Crow laws following the war. "De jure" segregation was outlawed by the Civil Rights Act of 1964, the Voting Rights Act of 1965, and the Fair Housing Act of 1968. In specific areas, however, segregation was barred earlier by the Warren Court in decisions such as the "Brown v. Board of Education" decision that overturned school segregation in the United States. "De facto" segregation, or segregation "in fact", is that which exists without sanction of the law. "De facto" segregation continues today in areas such as residential segregation and school segregation because of both contemporary behavior and the historical legacy of "de jure" segregation.