Final answer:
John Lewis was the first national chairman of the Student Nonviolent Coordinating Committee and later served as a U.S. Representative for Georgia's 5th congressional district.
Step-by-step explanation:
The first national chairman of the Student Nonviolent Coordinating Committee (SNCC) was John Lewis. He played a significant role in the Civil Rights Movement through his involvement in actions such as voter registration drives, sit-ins at lunch counters, and challenging the injustice of Jim Crow segregation in the South. Lewis's leadership in the SNCC and the broader movement was evident when he became one of the Big Six leaders of the Civil Rights Movement and delivered a keynote speech at the historic March on Washington in 1963. After his time with the SNCC, John Lewis continued his dedication to public service and was elected to a political office in Washington, D.C. He served as a U.S. Representative for Georgia's 5th congressional district from 1987 until his passing in 2020.