The elusive ideal of a world constitution is unlikely to be realized any time soon – yet important steps in that direction are happening in world politics. Milewicz argues that international constitutionalization has gathered steam as an unintended by-product of international treaty making in the post-war period. This process is driven by the logic of democratic power, whereby states that are both democratic and powerful – democratic powers – are the strongest promoters of rule-based cooperation. Not realizing the inadvertent and long-term effects of the specialized rules they design,...