In 1951, the Mendez v. Westminster case marked a pivotal moment in U.S. civil rights history when Sylvia Mendez and her family challenged school segregation in California. Denied enrollment in a white-majority school due to her Mexican-Puerto Rican descent, the Mendez family initiated a lawsuit against the discriminatory practices. The federal court's decision declared segregation based on national origin unconstitutional, setting a precedent for desegregation and influencing the landmark Brown v. Board of Education.