Final answer:
The 1920s movement that emphasized the unity of Africans worldwide was Pan-Africanism, led by figures like Marcus Garvey, who founded the UNIA and urged a return to African roots and governance. This movement helped foster African nationalism and influence African American identity and culture.
Step-by-step explanation:
Pan-Africanism and Marcus Garvey
The 1920s movement in Africa that emphasized the unity of Africans and people of African ancestry all over the world was known as Pan-Africanism. This movement sought to unite African peoples to achieve greater independence. A key figure during this time was Marcus Garvey, who founded the Universal Negro Improvement Association (UNIA) and was instrumental in promoting the idea that African peoples, wherever they lived, should unite into one body with one government. Garvey's influence extended to African American communities, where he encouraged a reconnection with African heritage and identity, championing a 'Back to Africa' movement.
The Pan-African movement was in part a reaction to the condition of black people around the world and had an important impact on African nationalism and the struggle for independence from colonial rule. Notable aspects of this movement included the establishment of the first Pan-African Congress in 1918, spearheaded by W. E. B. Du Bois, and the unveiling of artworks at the Metropolitan Museum of Art that celebrated African contributions to civilization. Garvey's UNIA, with its large membership, promoted Black pride and consciousness, fostering a sense of unity among African descendants.
Additionally, the Great Migration during WWI also played a substantial role in concentrating African-American populations in Northern cities, leading to the rise of organizations like the NAACP and efforts to combat racial injustice, all of which contributed to the flourishing of African American culture and political movements, including Pan-Africanism.