Final answer:
Pan-Africanism is a movement that aims to unite people of African descent politically and culturally. W. E. B. Du Bois attended the first and second Pan-African Congresses.
Step-by-step explanation:
Pan-Africanism is a movement that aims to politically and culturally unite people of African descent. It seeks to advocate for the independence and self-determination of African nations and people. One prominent African American who attended the first Pan-African Congress in 1900 (London) and the second in Paris (1919) was W. E. B. Du Bois. He was an activist and scholar who advocated for the rights and equality of African Americans and played a significant role in the early development of the Pan-African movement.