This lecture probes the reasons for confederate defeat and union victory. Professor Blight begins with an elucidation of the loss-of-will thesis, which suggests that it was a lack of conviction on the home front that assured confederate defeat, before offering another of other popular explanations for northern victory: industrial capacity, political leadership, military leadership, international diplomacy, a pre-existing political culture, and emancipation. Blight warns, however, that we cannot forget the battlefield, and, to this end, concludes his lecture with a discussion of the decisive Union victories at Gettysburg and Vicksburg in July of 1863.