This lecture picks off where the previous one left off, with a discussion of the legacies of John Brown. The most important thing about John Brown's raid, Professor Blight argues, was not the event itself, but the way Americans engaged with it after the fact. Next, Professor Blight discusses the election of 1860, a four-way battle won by the Republican candidate, Abraham Lincoln. In the wake of Lincoln's election, the seven states of the deep South, led by South Carolina, seceded. The lecture closes with an analysis of some of the rationales underlying southern secession.
David Blight, Why the Civil War Came, chapter 3
Charles R. Dew, Apostles of Disunion: Southern Secession Commissioners and the Causes of the Civil War