The war in Afghanistan was the longest and most expensive conflict in American history, spanning two full decades, four presidential administrations, trillions of dollars, and hundreds of thousands of lives. Yet when the last American helicopter lifted off from Kabul in August 2021, the Taliban, the very movement the United States had invaded to overthrow, marched back into power almost exactly where they had been twenty years earlier. Understanding how this happened requires examining not American military failures but Taliban strategic patience. The Taliban's survival strategy was built on a fundamentally different relationship with time. American military planning operated on political cycles, budget years, and rotation schedules. Taliban commanders thought in generations. They understood that the United States would eventually leave, and their  ...