Once upon a time, world’s fairs displayed the glory, wealth, and reach of European empires and those who wished to emulate them. Countries from Asia, Africa, and South America set up booths presenting ”native” products, alongside the latest steam engines, repeating rifles and other technological wonders of the “advanced” nations. The first World’s Fair in London in 1851 brought the translucent Crystal Palace; the Eiffel Tower served as the entrance arch to the Paris Exposition Universelle in 1889; in 1893 the World’s Columbian Exposition in Chicago symbolized America’s entry into the ranks of powers. In ten days, the Shanghai Expo is about to be unveiled, after the city spent billions building an extra air terminal, new subway lines, and sp...