Which case overturned the principle established by Plessy vs. Ferguson regarding school segregation?

The case that overturned the principle established by Plessy v. Ferguson regarding school segregation is Brown v. Board of Education. This landmark decision, handed down by the Supreme Court in 1954, declared that racial segregation in public schools violated the Equal Protection Clause of the Fourteenth Amendment. Brown v. Board addressed the "separate but equal" doctrine that was upheld in Plessy v. Ferguson, which allowed for legal segregation as long as the separate facilities were deemed equal.

The Court found that “separate educational facilities are inherently unequal,” thus effectively abolishing the legal foundation for racial segregation in schools. This ruling was a significant victory for the Civil Rights Movement, as it provided a judicial basis for challenging segregation and discrimination in various areas of public life beyond just education.