The right to bear arms supported the Civil Rights Movement by enabling minorities to defend themselves.
One example of a civil rights conflict without the guaranteed right to bear arms was the battle over apartheid in South Africa. This was a long conflict in which minority white government systematically took away black's rights (even citizenship). For decades the government put all resisters to apartheid in jail. After 50 years apartheid fell largely at the hands of Nelson Mandela. According to Mandela, "violence was the only weapon that would destroy apartheid." If gun rights had been guaranteed in South Africa it is likely that the conflict would have ended sooner.
In our research we found that many people involved in the Civil Rights Movement needed to protect themselves. For example, the Deacons for Defense used firearms to stop the KKK from lynching and firebombing innocent people. Martin Luther King, Jr. and Malcolm X needed guns to defend themselves and their families. In the case of Malcolm X, both Black Muslims and the KKK made attempts on his life.
Had it not been for the Second Amendment, it would have been more difficult for American Minorities to defend themselves during the Civil Rights Movement in the United States.