The war in Afghanistan is now the United States' longest-running war. For over a decade, the conflict in central Asia has been the stage for some of the shrewdest foreign policy, fiercest wartime strategy, and most delicate diplomacy the world has ever seen. In a country smaller than Texas, and home to thirty million people, an elusive enemy, shifting tribal dynamics, and bordering countries threaten the stability not only of the region, but of the world.