Final answer:
W.E.B. Du Bois was a co-founder of the National Association for the Advancement of Colored People (NAACP) in 1909, which played a significant role in advancing civil rights and opposing racial discrimination in the United States.
Step-by-step explanation:
One of the most prominent organizations founded by W.E.B. Du Bois is the National Association for the Advancement of Colored People (NAACP), established in 1909. The NAACP was a central part of the civil rights movement, challenging discriminatory practices, protesting against violence aimed at African Americans, and striving for equal rights through legal avenues.
Du Bois's role was crucial as he served as the director of publicity and research, and later as the editor of the NAACP's magazine, The Crisis. His involvement with the NAACP and his literary contributions, especially The Souls of Black Folk, greatly influenced the fight against racial injustice in the United States.