If the outflow of Africans that began in the late Middle Ages and peaked between the mid-eighteenth and mid-nineteenth centuries represented a radical break with the continent’s past, the belated but dramatic rebound in African population growth that began during the interwar years of the twentieth century can be seen as another radical break—this time, though, not merely for Africa, but for all of humankind. The population of Africa, which in all of its history had never been known to undergo rapid sustained growth, increased by about 600 percent in the twentieth century, rising from perhaps
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