Zanzibar Sultanate.
Since the establishment of the East African colonies, they have been relatively harmonious with the Zanzibar Sultanate.
The East African colonies have expanded into the western inland areas of East Africa, although this has affected the traditional trade routes of Arab merchants, they are not interested in indigenous slaves and ivory.
Each time they clear newly occupied lands, the East African colonies bring the natives, ivory, and other commodities to Dar es Salaam port for trade with merchants from various countries.
Unlike the Arab caravans that had to deal with the inland tribes of the Bantu people in the past, the East African colonies would directly shake things up, with a large number of natives falling into colonial hands during each expansion.
Naturally, the East African colonies wouldn't keep these people, directly lowering the price of slaves so that Arab merchants only needed to wait at the port for the colonies to deliver to them.
