America's Longest War Is Over. What Did The U.S. Gain From 20 Years In Afghanistan? | 2021 | News America's Longest War Is Over. What Did The U.S. Gain From 20 Years In Afghanistan?August 31, 2021 Jim Walsh on WBUR's "Here and Now" on August 31, 2021. The topic: "America's longest war is over. What did the US gain from 20 years in Afghanistan?"