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The immediate cause of the Civil War lay in the derangement of the nation’s two political systems—the constitutional system of the 1780s and the party system of the 1830s—and in their interaction with each other. Both these systems rested on an intricate set of balances: the constitutional, on a balance between federal and state power and among the three branches of the federal government; the party, on a competitive balance between party organizations at the national and state levels. The genius of this double system lay in its ability to morselize sectional and economic and other conflicts before they became flammable, and then through incremental adjustment and accommodations to keep the great mobiles of ideological, regional, and other political energies in balance until the next adjustment had to be made. This system worked well for decades, as the great compromises of 1820 and 1850 attested. The system was flexible too; when a measure of executive leadership was needed—to make great decisions about the West, as with Jefferson, or to adjust and overcome a tariff rebellion, as with Jackson—enough presidential authority could be exerted within the system to meet the need. But the essence of the system lay in balances, adjustment, compromise. Then, in the 1850s, this system crumbled. The centrifugal forces besetting it were so powerful that perhaps no polity could have overcome them; yet European and other political systems had encountered enormously divisive forces and survived. What happened in the United States was a fateful combination: a powerful ideology of states’ rights, defense of slavery, and “southern way of life” arose in the South, with South Carolina as the cutting edge; this was met by a counter-ideology in the urbanizing, industrializing, modernizing states, with Illinois as the cutting edge in the West.
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James MacGregor Burns (The American Experiment: The Vineyard of Liberty, The Workshop of Democracy, and The Crosswinds of Freedom)