The 20th anniversary of 9/11 finds American foreign policy in a peculiar place. The U.S. hasn’t stabilized the Middle East, permanently remade Afghan society or ended jihad. But no terrorist has managed to inflict another attack on the scale of Sept. 11 on the American homeland. As a result, the War on Terror has receded to the margins of U.S. politics as fears that the liberal world order is crumbling rise to the fore.

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