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Africa is home to one eighth of the worlds population. The most populated areas are along the Nile, Niger, Congo and Senegal rivers. The population is growing quickly due to increasingly better health care. Birthrates are very high, and families are often large. Many people have moved from countryside to cities, because of the poverty and lack of work, or to escape civil wars, droughts, and famines.
Most countries rely on the export of coffee, cocoa, or oil. In recent years, the prices have fallen. The amount that African countries earn from exports is often less then what they have to spend on imports. These factors, along with the growing population and effects of wars and droughts, mean economic difficulties for many African countries.
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