"An extremely rich and forceful intellectual history of the Progressive period, one that supersedes in many ways other nationalist interpretations that have come down through the tradition of Richard Hofstadter". -- American Historical Review. "Extraordinarily wide ranging and meticulously researched. Eisenach's historical retrieval enables careful consideration of the Progressives' achievements and establishes a fruitful new vantage on a much-studied era". -- American Political Science Review.