In the debates over Kansas’ statehood, the presidential campaigns of 1860, and their responses to Southern threats and acts of secession, American politicians in rival factions rooted their visions of American institutions and citizenry in rival interpretations of the nation’s founding. These differences in interpretation did not neatly fall alongside the Mason-Dixon Line. As shown in this thesis, Northerners opposed one other’s visions for the nation and policies to promote those visions. They disagreed with each other on the Founding Fathers’ vision as much as they did with their Southern counterparts. Mid-century Americans referred to the Founding in three ways: references to documents like the Declaration of Independence or Constitution...