Long Wars and the Constitution

In a wide-ranging constitutional history of presidential war decisions from 1945 to the present, Stephen M. Griffin rethinks the long-running debate over the “imperial presidency” and concludes that the eighteenth-century Constitution is inadequate to the challenges of a post-9/11 world.

The Constitution requires the consent of Congress before the United States can go to war. Truman’s decision to fight in Korea without gaining that consent was unconstitutional, says Griffin, but the acquiesc...