National Security & Defense. Presiding over a rapidly dividing Nation, Buchanan grasped inadequately the political realities of the time. Relying on constitutional doctrines to close the widening rift over slavery, he failed to understand that the North would not accept constitutional arguments which favored the South. Nor could he realize how sectionalism had realigned political parties: the Democrats split; the Whigs were destroyed, giving rise to the Republicans. Born into a well-to-do Pennsylvania family in 1791, Buchanan, a graduate of Dickinson College, was gifted as a debater and learned in the law. When Republicans won a plurality in the House in 1858, every significant bill they passed fell before southern votes in the Senate or a Presidential veto. The Federal Government reached a stalemate.