HOW has slavery affected the history of the United States?

"Before any meaningful reform could happen, people needed to recognize that the economic benefit was vastly overshadowed by the overwhelming repugnance, immorality, and inhumanity of slavery." meaning every thing change.

pan-africanism or pan-africanism is a political, philosophical, cultural and social movement that promotes african twinning, the defense of the rights of african people and the unity of africa under a single sovereign state, for all africans, both africa as of the african diasporas.