We are in a new era to which I do not belong.” So confided ex-president Calvin Coolidge to a close friend on a cold December day in 1932. He punctuated that melancholic thought a few weeks later by dying. Coolidge was right. Within months of his death, the New Deal would begin the recreation of the American political universe. From that moment to this one, the New Deal has served as the ground zero of the country’s political imagination. It is the Rosetta stone for understanding every enduring political development of the last seventy-five years.