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Brown v. Board of Education is the collective name for five cases of segregation in public schools from 1952 to 1954 before the Supreme Court. The class action lawsuits brought by affected parents against four states and the federal district were of the opinion that separate student facilities, broken down by skin color, violated the principle of equality in the Constitution of the United States. The Supreme Court unanimously endorsed this argument with its ruling of May 17, 1954, thereby overturning the jurisprudence that had been in effect for almost a hundred years. The decision marked the end of legally sanctioned segregation in state schools in the United States.