The president’s foreign policy may not have many friends among American academics, but the ones it does have tend to be ones that matter. In this essay, John Lewis Gaddis, author of Strategies of Containment and perhaps the world’s most distinguished historian of the Cold War, discusses why he thinks that Bush’s September 2002 report on "The National Security Strategy of the United States of America" represents "the most important reformulation of U.S. grand strategy in over half a century."