Final answer:
The main issue that divided civil rights activists and Black nationalists in the 1920s was whether the use of violence was ever justified.
Step-by-step explanation:
The main issue that divided civil rights activists and Black nationalists in the 1920s was whether the use of violence was ever justified. Civil rights activists believed in nonviolent resistance and argued for legal and peaceful means to achieve equality and justice for African Americans. On the other hand, Black nationalists advocated for self-defense and believed that violence was necessary to counteract the systemic racism and oppression faced by African Americans.
Learn more about the division between civil rights activists and Black nationalists in the 1920s