Final answer:
Martin Luther King Jr. played a crucial role in the American Civil Rights Movement, organizing protests and demonstrations against unfair treatment and laws towards African Americans. He and the Southern Christian Leadership Conference preached nonviolence and successfully led the Montgomery Bus Boycott, resulting in the end of racially segregated seating on buses.
Step-by-step explanation:
The civil rights leaders who stood up to champion a cause include Martin Luther King Jr., Rosa Parks, Mahatma Gandhi, and Nelson Mandela. One civil rights leader to discuss is Martin Luther King Jr. He played a crucial role in the American Civil Rights Movement, organizing protests and demonstrations across the southern part of the nation. King and the Southern Christian Leadership Conference preached nonviolence and used tactics like sit-ins and marches to fight against the unfair treatment and laws towards African Americans in the south. One of their major successes was the Montgomery Bus Boycott, where Rosa Parks's arrest for refusing to give up her seat led to over a year of African Americans walking to work or carpooling to protest segregated seating on buses. Their efforts ultimately led to the U.S. Supreme Court ruling that racially segregated seating on buses was unconstitutional.