Approximately 4,000 years ago the climate of the Sahel became extremely dry which resultedly caused the shrinking of the rivers and desertification. Obviously, this region was no longer favourable for farming and harvesting, so people who lived on those territories were forced to migrate to the more humid territories of West Africa.
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provide financial aid to rebuild the south
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it effected the geographical knowledge of the time, also the mapping of the east coast of Australia which paved the way for British settlement
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