Final answer:
De facto segregation stems from neighborhood patterns, contrasting de jure segregation that is based on legal requirements, as seen in the Harlem Nine case.
Explanation:
De facto segregation refers to school segregation stemming from neighborhood residential patterns, while de jure segregation pertains to school segregation stemming from legal requirements. In the case of the Harlem Nine, the courts decided that New York City was practicing de facto segregation by effectively segregating schools based on neighborhood patterns, leading to discriminatorily inferior education in certain areas.
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