In the second part of our special miniseries, “America's Longest War: What Went Wrong in Afghanistan,” you’ll hear more conversations Jake Tapper had with U.S. commanding generals who led the war effort, from the former Afghan Ambassador to the U.S., and from the veterans who served. We look at whether U.S. troop levels could have ever changed the trajectory of the war eight years after it began and examine the bigger question of whether the past 20 years of war was worth the immeasurable cost.

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