Martin Luther King Jr was a very courageous person and changed the world in many ways. MLK Jr was one of the people who helped to stop discrimination. He was one of the people who helped to boycott city busses. He had many peaceful protests and helped all of his followers do the same. He was a very courageous person and spread positivity throughout the nation peacefully. Martin Luther King Jr. was an American Baptist minister and activist who was a leader in the Civil Rights Movement. He is best known for his role in the advancing of civil rights using nonviolent.