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Please select a historical period: 25 years ago / 50 years ago / 80 years ago / 125 years ago / 150 years ago 250 years ago / 400 years ago / 700 years ago / 1,200 years ago 1,500 years ago / 2,000 years ago / 3,000 years ago / 4,000 years ago / 5,000 years ago / 10,000 years ago 4,000 Years Ago in South Africa As the people of the Sahel were forced south by the spread of the Sahara desert, a chain reaction started putting pressure on the herders and hunter-gatherers in southern Africa. A river culture develops along the Congo River valley, based on exploiting fish as the main food source. Pottery is developed at this time. back to map