It is worth noting that slavery in the Islamic world did not end till way later than the western world. It is still done illegally today with semi-legality in countries like Mauritiania. Saudi Arabia closed it's last slave market in 1965 while anti-arab decolonial revolution in Zanizabar ending Arabic slavery of Blacks and the creation of an autonomous state. In the end, the Black natives not just overthrew but began to genocide their former rulers. Pic related.