Recent scholarship in neo-evolutionary sociology has rejected stage-models in favor of multilinear theories that shift the study of sociocultural change away from teleological arguments toward those that emphasize selection pressures and macrodynamics. The paper below adopts a neo-evolutionary frame to revisit one of the most epochal moments in human sociocultural evolution, the urban revolution (about 5,000 years ago in Mesopotamia, China, Egypt, and perhaps the Indus Valley) and the rise of the first political units. Shifting the analysis from conventional perspectives, this paper asks the question why the polity was the first autonomous institution besides kinship and what consequences did this have on the trajectory of the human societies, and more generally, human sociocultural evolution. By doing so, a slightly different historiography is presented in which institutional autonomy corresponds not with stages, but rather an historical “phasing” that emphasizes the role that institutional entrepreneurs have played in driving institutional evolution via structural opportunities and historical contingencies.