On August 15, 2021, the Taliban entered the Afghan capital of Kabul, completing a rapid takeover over the country with a speed that surprised many Afghans and Americans alike. The Taliban’s advance came as the United States was completing the military withdrawal. The U.S. military and diplomatic withdrawal and evacuation operation concluded on August 30, 2021, with the departure of U.S. forces from Afghanistan. The fall of the elected Afghan government, which had been supported by billions of dollars in U.S. assistance over the course of nearly two decades, raises significant questions about past, present, and future U.S. policy.