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Sub-Saharan Africa has been experiencing phenomenal population growth since the beginning of the XXth Century, following several centuries of population stagnation attributable to the slave trade and colonization. The region’s population in fact increased from 100 million in 1900 to 770 million in 2005. The latest United Nations projections, published in March 2007, envisaged a figure of 1.5 to 2 billion inhabitants being reached between the present and 2050.