Richard ZhangPhiladelphia, Pennsylvania, United States Shanghai, 1936: Positioned at the Yangtze Delta, this sprawling, bustling seaport was a multiplicity of cities. It was China’s most lucrative commercial hub for many business elites; a lavish, cosmopolitan adopted home for expatriates from at least forty-eight different nationalities; and a chaotic urban jungle for prostitutes, gangsters, and slum-dwellers…