Key events that defined Martin Luther King Jr.’s legacy include his role in the Montgomery Bus Boycott, the March on Washington, and his leadership in the Civil Rights Movement. The boycott catalyzed widespread activism against segregation, while his iconic "I Have a Dream" speech at the March on Washington highlighted the struggle for racial equality. King’s commitment to nonviolence, demonstrated through protests and sit-ins, garnered national attention and support for the movement. Tragically, his assassination in 1968 immortalized his dedication to social justice and peace, establishing him as a lasting symbol of the fight against injustice.