By the early twentieth century, Chinese residents of the northern treaty-port city of Tianjin were dwelling in the world. Divided by nine foreign concessions, Tianjin was one of the world's most colonized and cosmopolitan cities. Residents could circle the globe in an afternoon, strolling from a Chinese courtyard house through a Japanese garden past a French Beaux-Arts bank to dine at a German caf and fall asleep in a British garden city-style...