DuKai photographer/Moment/Getty Images Chongqing, one of China’s lesser known megacities, is easily one of the maddest places ...

China already has at least five of the world’s megacities and a dozen more within striking distance. In these cities, at least for now, rural workers remain a socially and legally segregated class.

China has seven megacities with a population of more than 10 million, and as home to 24.87 million people, Shanghai tops them all. The scale of social governance needed for these megacities is ...