In this chapter, I apply the theory of the reasoning state to re-interpret the progressive era rise of the administrative state. Three forces combined to activate the concerns articulated in the theory. First, the economy became far more complex and interdependent after the Civil War, changes that both called for state intervention and also made it highly challenging for the public to effectively audit those interventions. Second, economic power and hence the ability to influence the democratic organs of government became far more unequal, further setting the ground for public distrust of policy outputs. Third, a media revolution occurred around the turn of the century. Changes in print technology and the rise of new media forms, notably the muckrakers, altered the information environment to shed light on abuses of the public trust. Together, these forces spurred (justified) distrust of the prevailing Madisonian form, and led to the rise of progressive era administrative bodies.