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  1. Certain 4th millennium BC events were precursors to the 3rd millennium BC: c. 3700-1800 BC: Caral-Supe Chico civilization. Caral-Supe flourished between the fourth and second millennia BC, with the formation of the first city generally dated to around 3500 BC, at Huaricanga, in the Fortaleza area. It is from 3100 BC onward that large-scale ...

  2. It was prior to the end of the African humid period (c. 3900 BC) and the desiccation of the Green Sahara. During this time, sub-Saharan Africa remained in the Palaeolithic. As the grasslands of the Sahara began drying after c. 3900 BC, herders moved into the Nile Valley and by the middle of the 3rd millennium BC into eastern Africa.

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