Watch Cineb. The longest war in America's history was sparked by the terrorist attacks on Sept. 11, 2001. Less than a month later U.S. forces entered Afghanistan and ousted the Taliban. Chronicling a conflict that has spanned more than a decade and bridged generations, Inside the Afghanistan War shares the comprehensive 11-year-trajectory from its swift and relentless beginnings to the eve of the U.S. pullout in 2014.