Final answer:
Martin Luther King Jr. leveraged nonviolent protests to challenge racial segregation, leading successful campaigns like the Montgomery Bus Boycott. His philosophy and leadership were pivotal in the civil rights movement, culminating in significant works like his 'Letter from a Birmingham Jail.' His assassination in 1968 triggered widespread unrest and further exposed racial divides.
Step-by-step explanation:
Reverend Martin Luther King Jr. was a monumental figure in advancing civil rights through nonviolent protest. As leader of the Southern Christian Leadership Conference (SCLC), King utilized tactics like boycotts, marches, and sit-ins to combat racial segregation and discrimination. The Montgomery Bus Boycott exemplifies a major success where after more than a year of persistent nonviolent resistance, the U.S. Supreme Court declared bus segregation unconstitutional. In 1963, the campaign in Birmingham saw violent responses to peaceful protests, prompting King to write the 'Letter from a Birmingham Jail,' arguing the urgency for civil rights. Tragically, King was assassinated in 1968, which led to nationwide riots and heightened racial tensions.