The 9/11 attacks catalyzed a tremendous shift in American foreign policy in the Middle East. Rather than prioritizing petrol, Washington targeted terrorist organizations, dethroned a dictator, and lobbied throughout the region for liberalization. Yet despite the billions of dollars spent policing Baghdad and protecting Benghazi, the unpopularity of the United States in the Arab world continues to be fueled by the belief that Islamist terrorists had nothing to do with 9/11, with many claiming the attacks were an American, Israeli, or joint American-Israeli conspiracy. In this sense, overcoming 9/11 revisionism is, perhaps, the greatest challenge facing American public diplomacy in the coming decade: So long as such conspiracy theories persist, Arabs will continue to view American policies aimed at preventing “another 9/11” as thoroughly illegitimate since, as they see it, 9/11 is just a big American lie.

