Others are satellite towns on the outskirts of major cities. Ruiru, home to 400,000 on the fringes of Nairobi, Kenya’s capital, is the sixth-fastest-growing city in Africa. At the top of the ...

Former New York City Mayor Michael Bloomberg lauded the urbanization of Africa. “In 2011, there were 52 African cities with a population higher than one million people. By 2016, in only two ...