The formation of the United Nations in 1945 proved essential to the decolonization of the world, as Eva-Maria Muschik elegantly demonstrates in this state-of-the-art international history. In its first twenty years, the UN machinery was instrumental in new states’ attainment of formal sovereignty—and played an even more pivotal role in the development of many new states after their emergence. Revising our understanding of an era in which the UN’s contribution has often been criticized or trivialized, Muschik has transformed the study of international governance.