 In the mid 19th century, the Bobangi people became major slave traders and sold their captives to the Americas using the Ubangi river to reach the coast.During the 18th century Bandia-Nzakara peoples established the Bangassou Kingdom along the Ubangi River.In 1875, the Sudanese sultan Rabih az-Zubayr governed Upper-Oubangui, which included present-day CAR.