What significant action did Strom Thurmond take to oppose school desegregation?

Strom Thurmond conducted a lengthy filibuster in the Senate as a significant action to oppose school desegregation. This tactic was utilized as a means of delaying or preventing the passage of civil rights legislation, particularly in response to the Supreme Court's ruling in Brown v. Board of Education, which declared racial segregation in public schools unconstitutional.

Thurmond's filibuster in 1957 lasted for over 24 hours, making it one of the longest in Senate history. During his speech, he expressed his strong opposition to desegregation and highlighted the Southern perspective on maintaining segregation in schools. This action not only showcased Thurmond's commitment to opposing civil rights efforts but also reflected the broader resistance among certain Southern politicians against desegregation measures during that era.

The other options present actions that did not specifically relate to his approach towards school desegregation. Leading a march to Washington or organizing a nationwide boycott would imply a more organized form of activism often associated with civil rights leaders rather than a legislative tactic. Signing the Southern Manifesto, while a notable action taken by Southern lawmakers in response to the Supreme Court's decision, was less directly impactful compared to Thurmond's unprecedented use of the filibuster to express and