The recent spate of secessionist conflicts has inspired many of us to return to the classics of political theory for moral guidance on statebreaking. Because Hobbes, Locke, Rousseau, et al. are virtually silent on this topic, however, we look in this paper at the writing of Abraham Lincoln.
Lindsay, Peter, and Christopher Heath Wellman. 2003. "Lincoln on Secession." Social Theory & Practice 29, no. 1: 113-135.