For nearly a year, Iraq has been the centerpiece of U.S. President George W. Bush’s foreign policy. There have been multiple reasons for this obsession, but in the end, Bush created a situation in which Iraq became the measure of his administration. However, over the extraordinarily long run-up to a decisive confrontation with Baghdad, a massive, global opposition to U.S. policy on Iraq has emerged on both the public and state levels. Creating the sort of coalition that the United States enjoyed in 1991 has become impossible. This war, if it comes, will be fought in the face of broad opposition. The question now has arisen as to whether the United States would back away from war in the face of this opposition. Our analysis is that, at this point in history, the United States has few choices left: The constraints that now surround U.S. policy indicate that Washington will have to choose war.