West Africa

West Africa

In the western Sahel the rise of settled communities occurred largely as a result of the domestication of millet and of sorghum. Archaeology points to sizable urban populations in West Africa beginning in the 2nd millennium BC. Symbiotic trade relations developed before the trans-Saharan trade, in response to the opportunities afforded by north-south diversity in ecosystems across deserts, grasslands, and forests. The agriculturists received salt from the desert nomads. The desert nomads acquired meat and other foods from pastoralists and farmers of the grasslands and from fishermen on the Niger River. The forest-dwellers provided furs and meat. Dhar Tichitt and Oualata in present-day Mauritania figure prominently among the early urban centers, dated to 2,000 BC. About 500 stone settlements litter the region in the former savannah of the Sahara. Its inhabitants fished and grew millet. It has been found[by whom?] that the Soninke of the Mandé peoples were responsible for constructing such settlements. Around 300 BCE the region became more desiccated and the settlements began to decline, most likely relocating to Koumbi Saleh. Architectural evidence and the comparison of pottery styles suggest that Dhar Tichitt was related to the subsequent Ghana Empire. Djenné-Djenno (in present-day Mali) was settled around 300 BC, and the town grew to house a sizable Iron Age population, as evidenced by crowded cemeteries. Living structures were made of sun-dried mud. By 250 BCE Djenné-Djenno had become a large, thriving market town.