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===Early agriculture=== Around 4000 BC, the climate of the Sahara and the Sahel started to become drier at an exceedingly fast pace. This climate change caused lakes and rivers to shrink significantly and caused increasing [[desertification]]. This, in turn, decreased the amount of land conducive to settlements and caused migrations of farming communities to the more humid climate of [[West Africa]].<ref>{{cite book | editor-first = Patrick K. | editor-last = O'Brien | title = Oxford Atlas of World History | year = 2005 | publisher = Oxford University Press | location = New York | pages = 22β23 }}</ref>
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