9/11 legacy: One endless war against many radical enemies

Northern Alliance soldiers, aligned with the U.S., watch as American warplanes drop bombs on the Taliban on Nov. 19, 2001, around the city of Kunduz, Afghanistan. The U.S.-led coalition quickly drove the Taliban from power, but 15 years later, the Americans are still helping the Afghan army battle the Islamist radicals.
Northern Alliance soldiers, aligned with the U.S., watch as American warplanes drop bombs on the Taliban on Nov. 19, 2001, around the city of Kunduz, Afghanistan. The U.S.-led coalition quickly drove the Taliban from power, but 15 years later, the Americans are still helping the Afghan army battle the Islamist radicals.