One year after the terror attacks of September 11, 2001, the administration of President George W. Bush introduced a revolutionary foreign policy strategy--the Bush Doctrine. Proponents of this strategy advocated the use of American 'hard power' as a tool to promote freedom and democracy, beginning with the invasions of Afghanistan and Iraq. Opponents of the doctrine saw it as dangerously nationalistic, with the potential to entangle the United States in a myriad of protracted international conflicts. This thesis will identify aspects of nationalism within post-9/11 American foreign policy and illuminate the incompatibility of nationalism and the fundamental tenets of conflict resolution. This study theorizes that nationalism played a significant role in the development of the Bush Doctrine. Although its advocates promote specific policies historically associated with nationalism, as a rule they have not acknowledged its influence. Conversely, opponents of the doctrine acknowledge this influence and warn of its destructive characteristics. The study presented herein identifies nationalism as a powerful force in American culture and politics--one that has a profound influence on American foreign policy and on the longevity of our foreign wars.