This article examines representations of the League of Nations as a creature of early twentieth century modernity. In particular it focuses on the propagation of the doctrine of rationalization in that forum from mid-1920s until early 1930s. Rationalization came to signify not only the scientific organization and control of social development, but also world interpenetration in technical, industrial, cultural and political spheres. Conjuring images of a globe crisscrossed by streams of electric energy, League functionaries and devotees spoke of a bright new dawn. Industrial flow would meld the ‘minds of men’. Discussions of globalization today have a similar repertoire of arguments and many of the same linguistic items as of rationalization. In the inter-war period rationalization was held out as the destiny of the world's people, promising both harmonious integration and cultural profusion. Its rapid evaporation from intellectual and public discourse in the face of the crises of the 1930s serves as a warning to those who would weave fantastic tales of globalized tomorrows.