This series of case-studies of reform legislation in Congress during the early twentieth century explores the nature of progressivism and the processes of political change which resulted in the establishment of the modern American state. Among the topics covered are railroad regulation, labor relations, social policy of the District of Columbia, Republican insurgency, and the nature of Democratic progressivism. The work will be of interest to students of twentieth-century political history, the history of Congress, and the origins of the modern American state.