Martin Luther King Jr. was the prominent figure in the civil rights movement who led the March on Washington for Jobs and Freedom in 1963. His leadership and powerful rhetoric, particularly his "I Have a Dream" speech, galvanized widespread support for civil rights, advocating for racial equality, justice, and economic opportunity. The March on Washington was a pivotal moment in the movement, bringing together over 250,000 demonstrators, showcasing solidarity among diverse groups, and pressuring the government to address civil rights injustices. King's efforts played a crucial role in the eventual passage of significant legislation, including the Civil Rights Act and the Voting Rights Act.