French West Africa with the exception of the Senegalese Communes, the administrative structure of French rule at the lower levels remained constant, based upon the Cercle system. This was the smallest unit of French political administration in French colonial Africa that was headed by a European officer. They might range in size, but French Sudan (modern Mali) consisted of less than a dozen Cercles for most of its existence. Thus, a Cercle Commander might be the absolute authority over hundreds of thousands of Africans. A Cercle consisted of several cantons, each of which in turn consisted of several villages, and was almost universal
Slavery in Sudan kingdoms' fall in 1504, the Ottomans conquered most of Nubia, while the Funj conquered much of modern day Sudan from Darfur to Khartoum ; the Funj began to use slaves in the army in the reign of Badi III (r. 1692-1711). Later, Egyptian slavers began raiding modern South Sudan. In particular, the ruler Muhammad Ali of Egypt attempted to build up an army of Southern Sudanese slaves with the aid of the Nubian slavers. Attempts to ban slavery were later attempted by colonial British authorities in 1899, after they conquered the region. According to British explorer (and abolitionist) Samuel Baker,