Answer: Plessy v. Ferguson.
Explanation:
The Supreme Court decision in Brown v. Board of Education overturned its earlier decision in Plessy v. Ferguson. The case of Plessy v. Ferguson in 1896 had established the principle of 'separate but equal', stating that racial segregation was not unconstitutional as long as the separate facilities were equal. However, in 1954, the Brown v. Board of Education decision rejected this principle, asserting that segregation in public schools was inherently unequal and violated the Equal Protection Clause of the Fourteenth Amendment, thus changing the direction of education law and policy in the United States.
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