Sub-Saharan Africa will lead the world in urban growth. Africa is the globe’s least‐urbanized continent, accommodating 11.3 percent of the world’s urban population, and the Sub‐Saharan region is the continent’s least‐urbanized area. Nonetheless, the region’s cities are expanding rapidly. The United Nations predicts that Africa will overtake Asia as the world’s most rapidly urbanizing region by 2025 (UN 2014). In the coming 20 years, the total population of the continent will exceed the combined populations of Europe and the Americas. By 2050, Nigeria alone will contribute nearly 10 percent of the world’s total population growth. Although the nature and pace of urbanization vary among countries, with over a quarter of the world’s fastest-growing cities, Africa is undergoing a massive urban transition.

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