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De jure (Latin: "by law") segregation refers to racial separation mandated and enforced by law — the Jim Crow system of the American South, in which state statutes required separate facilities for Black and white citizens and enforced that separation with criminal penalties. De facto (Latin: "in fact") segregation refers to racial separation that exists in practice — through residential patterns, economic inequality, or social custom — without being legally mandated. The civil rights movement of 1954–1963 focused primarily on dismantling de jure segregation, which was the clearest constitutional violation.
Homer Plessy, a Louisiana man who was one-eighth Black, deliberately boarded a whites-only railroad car and was arrested in a planned test of Louisiana's Separate Car Act. The Supreme Court upheld the law 7-1, endorsing the "separate but equal" doctrine — holding that racial separation did not violate the Fourteenth Amendment's equal protection clause as long as facilities were nominally equal. Justice John Marshall Harlan's lone dissent — "Our Constitution is color-blind" — expressed the principle that would not prevail until Brown v. Board fifty-eight years later.
State and local laws enforcing racial segregation in the Southern United States, in force from the post-Reconstruction era (1870s) through the civil rights era (1960s). Named after a minstrel show character, "Jim Crow" laws mandated separation of Black and white citizens in schools, transportation, restaurants, hotels, theaters, hospitals, courts, cemeteries, and virtually every other public space. Violation of these laws was a criminal offense. Jim Crow was not social custom that happened to produce segregation — it was an affirmative legal system that required segregation and punished its violation.
Organizations formed across the South in the months following the Brown v. Board decision (1954) to organize resistance to school desegregation. Sometimes called the "uptown Klan," the Councils used economic pressure — threatening the employment and credit of Black citizens and white moderates who expressed willingness to comply with desegregation orders — rather than the overt violence associated with the Ku Klux Klan, though Council members frequently overlapped with Klan membership. The Councils were a significant force behind the organized "massive resistance" of Southern state governments to federal court orders.