“War,” the late French prime minister Georges Clemenceau famously remarked, “is a series of catastrophes that results in a victory.” That is a good way to think about the United States’ odyssey in the “war on terror.” For 20 years, Washington has struggled and mostly failed to reduce the overall level of global terrorism and to create a healthier political climate in the Muslim world. It has also endured slow, grinding quagmires and sharp, humiliating setbacks. Yet on the most fundamental level, the United States has achieved its strategic objective: it has prevented catastrophic attacks against the U.S. homeland, mainly by becoming extremely proficient at destroying terrorists’ sanctuaries and pulverizing their networks.

The United States has paid too high a price for this success. Yet that price has fallen dramatically over time as Washington has developed what is, on balance, a better counterterrorism approach. After conducting unsustainably expensive military commitments in Afghanistan and Iraq, the United States underreached by pulling back from the broader Middle East too fast and allowing old threats to reemerge. 

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