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Foreigners see this more clearly than Americans. As Goh Chok Tong, the prime minister of Singapore, said on a visit to Washington in 2004, “The key issue is no longer WMD or even the role of the U.N. The central issue is America’s credibility and will to prevail.” Just so. If you live in Tikrit or Fallujah, the Iraq War was about Iraq. If you live anywhere else on the planet, the Iraq War was about America, and the unceasing drumbeat of “quagmire” and “exit strategy” communicated to the world an emptiness at the heart of American power — like the toppled statue of Saddam that proved to be hollow. On the eleventh anniversary of 9/11, mobs trashed U.S. embassies across the region with impunity. A rather more motivated crowd showed up in...