Examining the special relations between On the Social Contract and the Constitutional Project for Corsica, this essay argues that Rousseau conceives of constitutionalism on the basis of his understanding of the “natural development” of any state. What is “natural” is a certain order in which developmental periods best emerge, such that any state's disordered development will always result in its premature “death.” The essay explains four aspects of Rousseau's conception of properly ordered political development: the nature of a state's beginning; the relation between the two “great springs” of human conduct; the influence of external nature on human nature and justice; and the inevitable “end” of even the best state.