The United States Supreme Court hands down a unanimous decision in Brown v. Board of Education of Topeka, Kansas.

Brown v. Board of Education of Topeka, 347 U.S. 483 (1954), was a landmark decision of the U.S. Supreme Court in which the court ruled that U.S. state laws establishing racial segregation in public schools are unconstitutional, even if the segregated schools are otherwise equal in quality. The court's decision partially overruled its 1896 decision Plessy v. Ferguson, declaring that the "separate but equal" notion was unconstitutional for American public schools and educational facilities. It paved the way for integration and was a major victory of the civil rights movement, and a model for many future impact litigation cases.The underlying case began in 1951 when the public school system in Topeka, Kansas, refused to enroll local black resident Oliver Brown's daughter at the elementary school closest to their home, instead requiring her to ride a bus to a segregated black school farther away. The Browns and twelve other local black families in similar situations filed a class-action lawsuit in U.S. federal court against the Topeka Board of Education, alleging that its segregation policy was unconstitutional. A three-judge panel of the U.S. District Court for the District of Kansas rendered a verdict against the Browns, relying on the precedent of Plessy v. Ferguson, in which the Supreme Court had ruled that racial segregation was not in itself a violation of the Fourteenth Amendment's Equal Protection Clause if the facilities in question were otherwise equal, a doctrine that had come to be known as "separate but equal". The Browns, then represented by NAACP chief counsel Thurgood Marshall, appealed the ruling directly to the Supreme Court.

In May 1954, the Supreme Court issued a unanimous 90 decision in favor of the Browns. The court ruled that "separate educational facilities are inherently unequal", and therefore laws that impose them violate the Equal Protection Clause of the Fourteenth Amendment of the U.S. Constitution. However, the decision's 14 pages did not spell out any sort of method for ending racial segregation in schools, and the court's second decision in Brown II (349 U.S. 294 (1955)) only ordered states to desegregate "with all deliberate speed".

In the Southern United States, especially the "Deep South", where racial segregation was deeply entrenched, the reaction to Brown among most white people was "noisy and stubborn". Many Southern governmental and political leaders embraced a plan known as "Massive Resistance", created by Virginia Senator Harry F. Byrd, in order to frustrate attempts to force them to de-segregate their school systems. Four years later, in the case of Cooper v. Aaron, the court reaffirmed its ruling in Brown, and explicitly stated that state officials and legislators had no power to nullify its ruling.

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