This volume presents the best scholarly thinking about why the U.S. invaded Iraq in 2003, a pivotal event in modern US foreign policy and international politics.The years since the announcement of the invasion of Iraq by George W. Bush in 2003 have revealed that the WMD threat was not the urgent threat the administration declared and that Saddam Hussein was not involved with Al Qaeda or 9/11. At least in part because of these revelations a majority of Americans (not to mention a majority of people globally) now believe that invading Iraq was a mistake and that the Bush administration misled the public to build support for war. Lending credibility to public doubts is a growing number of critical scholarly analyses and in-depth journalistic investigations about the invasion, which mostly suggests that the administration was not fully candid about its reasons for wanting to move against Iraq when it did.Thus the question remains: Why did the United States invade Iraq? The central purpose of this volume is to spur and inform the debate by organizing the best recent thinking of foreign policy and international relations experts about why the U.S. invaded Iraq. Taking a broad range of arguments ' about the role of ideas, Israel, and oil, in partcular - and organizing them around a coherent structure, the book highlights current areas of agreement and disagreement, and allows scholars directly to talk to each other.The volume will be of much interest to students of the Iraq War, US foreign and security policy, strategic studies, Middle Eastern politics and IR/Security Studies in general.