Thurgood Marshall showcased that the practice of segregation in public schools provided African American students with an inferior education which ultimately overturned the idea that segregation was constitutional.

Marshall argued in the landmark case Brown v. Board of Education that segregation in public schools violated the Equal Protection Clause of the 14th Amendment. He showed that separate educational facilities were inherently unequal and deprived African American students of the same educational opportunities as white students.

Through his arguments and legal strategies, Marshall successfully convinced the Supreme Court to rule in favor of desegregating public schools, effectively ending legal segregation in education. This decision had far-reaching implications, not only for education but also for the broader civil rights movement in the United States.

Marshall's work as a lawyer and his victory in the Brown case helped to shatter the myth of racial superiority and paved the way for further advancements in the fight for equality and civil rights for all Americans. His legacy continues to inspire social justice movements and advocates for equality to this day.