Unpopular opinion: the massive African slave trade was only made possible because the coastal kingdoms of the continent (Mali, Benin, Dahomey, Mozambique, etc), saw a golden opportunity to gain goods and weapons they otherwise had no access to. The Europeans (and muslims, too, Oman was a big slave trading kingdom) obviously have their well deserved share of the responsibility, defending said kingdoms and for essentially turning the slave trade into an industry and a massacre, but don’t erase or ignore the Africans’ own responsibility in the process, because it was them who ventured into the continent to hunt and capture people to be sold at the ports.