 These expeditions were typically carried out by African states, such as the Oyo empire (Yoruba), Kong Empire, Kingdom of Benin, Imamate of Futa Jallon, Imamate of Futa Toro, Kingdom of Koya, Kingdom of Khasso, Kingdom of Kaabu, Fante Confederacy, Ashanti Confederacy, Aro Confederacy and the kingdom of Dahomey.Europeans rarely entered the interior of Africa, due to fear of disease and moreover fierce African resistance.The slaves were brought to coastal outposts where they were traded for goods.