The U.S. government has now spent 20 years and $145 billion trying to rebuild Afghanistan, its security forces, civilian government institutions, economy, and civil society. The Department of Defense (DOD) has also spent $837 billion on warfighting, during which 2,443 American troops and 1,144 allied troops have been killed and 20,666 U.S. troops injured. Afghans, meanwhile, have faced an even greater toll. At least 66,000 Afghan troops have been killed. More than 48,000 Afghan civilians have been killed, and at least 75,000 have been injured since 2001—both likely significant underestimations. 

The extraordinary costs were meant to serve a purpose—though the definition of that purpose evolved over time. At various points, the U.S. government hoped to eliminate al-Qaeda, decimate the Taliban movement that hosted it, deny all terrorist groups a safe haven in Afghanistan, build Afghan security forces so they could deny terrorists a safe haven in the future, and help the civilian government become legitimate and capable enough to win the trust of Afghans. Each goal, once accomplished, was thought to move the U.S. government one step closer to being able to depart. 

While there have been several areas of improvement—most notably in the areas of health care, maternal health, and education—progress has been elusive and the prospects for sustaining this progress are dubious. The U.S. government has been often overwhelmed by the magnitude of rebuilding a country that, at the time of the U.S. invasion, had already seen two decades of Soviet occupation, civil war, and Taliban brutality.