"A real nondescript : James Madison's thoughts on states rights and federalism / Jack N. Rakove -- James Madison and the constitution's convention for proposing amendments / Robert G. Natelson -- States' rights and nullification in the north : opposition to the fugitive slave laws / Paul Finkelman -- Still too close to call? : rethinking Stamp's "The concept of a perpetual union" / Daniel W. Hamilton -- Secession and breach of compact : the law of nature meets the U.S. Constitution / Stephen C. Neff -- William Rawle and secession : legal rights and political wrongs / H. Jefferson Powell -- The fourteenth amendment and the unconstitutionality of secession / Daniel A. Farber -- Interposition : an overlooked tool of American constitutionalism / Christian G. Fritz -- Originalism's limits : interposition, nullification, and secession / Lee J. Strang -- Union and states rights 150 years after Sumter : some reflections on a tangled political and constitutional conundrum / Sanford V. Levinson -- Remembering our second revolution : sesquicentennial reflections on Civil war Historiography / Norman W. Spaulding.