What America failed to understand about its war in Afghanistan

Carter Malkasian As the United States leaves Afghanistan after 20 years of war, there can be little doubt that we lost the war — or to put it more gently, did not attain our objectives. In recent weeks, the Taliban have advanced across the north of the country. Bereft of US support, the Afghan army and police have reportedly lost more than two dozen districts over the course of a month and are now fighting on the outskirts of key cities such as Kandahar and Mazar-e-Sharif. Senior US officials have…