He joined several groups including NAACP and SCLC. The black community would have never gotten the courage to stand up for their cause if it had not been for him. He set a precedent that you should do anything for what you believe. Even after being arrested multiple times over the course of his life because he lead strikes. He also inspired many through his speeches. That were not only moving to the blacks but they touched the hearts of the whites.
Martin Luther King Jr. was an amazing person who inspired people to stand up for what they believed in and impacted America through his actions towards his cause. By joining the civil rights groups he showed how dedicated he was. Many people chose to follow him and actually start to do stuff about their terrible situation. You can tell that he truly cared for both his family and his country. He wanted his family and all other to be treated equally and with respect like all humans