How many of the twelve were African-American?

There were twelve African Americans. They were: Martin Luther King Jr. (Jr.), Ralph David Abernathy, James Bevel, John Lewis, Andrew Young, Cesar Chavez, Huey Newton, Stokely Carmichael, Elijah Muhammed, Robert Williams, Malcolm X. The other three were Chavez, Newton, and Carmichael. Chavez was Mexican American, but he did a lot of work with Cesar Chavez, who was African American.If you need more details see here,https://www.africanamericanuts.com/.