Garvey built the largest mass Black political movement of the early 20th century through the Universal Negro Improvement Association, organizing millions across Africa, the Caribbean, and the Americas. He promoted Black self-determination, economic independence, and global African unity at a time of intense racial violence and colonial domination. Despite state repression, imprisonment, and deportation, Garvey’s movement reshaped Black political consciousness and laid the ideological foundation for later Black nationalist and liberation movements worldwide.