Word: sahel
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Dates: during 1990-1999
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...Africa, but the 4th millennium B.C. was a crucial time for the rest of the continent as well. The climate started to get progressively dryer, and the Sahara expanded into a vast desert. Nomadic tribes that herded cattle, sheep and goats on the fringes of the Sahara and the Sahel and in the Sudan were forced southward to the Central African savannas, where they gradually displaced hunter-gatherers who had dominated the area for thousands of years. Only in southern Africa, where farming was difficult, did the Stone Age hunter-gatherers and fishermen continue to hold their own. In caves...