How did Plessy v. Ferguson influence the American civil rights movement?

The 1896 Supreme Court decision in Plessy v. Ferguson served as a major setback for civil rights by providing constitutional sanction to the doctrine of "separate but equal." By ruling that state-mandated racial segregation did not violate the Fourteenth Amendment, the Court effectively legitimized the Jim Crow system, which enforced a racial caste system across the American South for decades.123

This judicial precedent hindered the American civil rights movement by forcing activists to operate within a legal framework that permitted systemic inequality. However, the movement eventually utilized the inherent contradictions of this doctrine to dismantle it. By the mid-20th century, lawyers successfully challenged the "separate" nature of these facilities in cases like Sweatt v. Painter (1950), leading to the landmark 1954 ruling in Brown v. Board of Education. The Brown decision explicitly rejected Plessy, declaring that separate facilities are inherently unequal and catalyzing the broader struggle for equality that defined the 1960s.24