Trade was the key to the emergence of organized communities in the savanna portions of Nigeria. Prehistoric inhabitants adjusting to the encroaching desert were widely scattered by the third millennium BC, when the desiccation of the Sahara began.
Commerce was the key to the emergence of organized communities in the savanna regions of Nigeria. Ancient inhabitants adapting to the advancing desert were dispersed widely by the third millennium BC, when the desiccation of the Sahara started.