The Progressive Era signaled the beginning of a new philosophical thread that dominated the 20th century. The following video from The Heritage Foundation course "America's Two Regimes" provides a terrific overview of the tension between Constitutional philosophy versus Progressive philosophy. Lecture One: America’s Two Regimes by David Azerrad, Ph.D.
Progressives and Conservatives define "The People" differently. While conservatives have an inclusive view that includes ALL people, Progressives have a more limited view that excludes some of the people.
Theodore Roosevelt's "The Right of the People to Rule" March 20, 1912 How does TR define "the people"?
William Howard Taft's "Who Are the People?" Campaign Trail 1912 How does Taft define "the people"?