In the United States 
Sectionalism in 1800's America refers to the different economies, social structures, customs, and political values of the North and South. It increased steadily 1800–1850 as the North, without slavery, industrialized, urbanized and built prosperous factories, while the deep South concentrated on plantation agriculture based on slave labor, together with subsistence farming for the poor whites. The South expanded into rich new lands in the Southwest (from Alabama to Texas). However, slavery declined in the border states and could barely survive in cities and industrial areas (it was fading out in cities such as Baltimore, Louisville and St. Louis), so a South based on slavery was rural and non-industrial. On the other hand, as the demand for cotton grew the price of slaves soared. Historians have debated whether economic differences between the industrial Northeast and the agricultural South helped cause the Civil War. Most historians now disagree with the economic determinism of historian Charles Beard in the 1920s and emphasize that Northern and Southern economies were largely complementary.
However historians agree that social and cultural institutions were very different North and South. In the South the rich men owned all the good land, leaving the poor white farmers with marginal lands of low productivity. Fears of slave revolts and abolitionist propaganda made the South militantly hostile to suspicious ideas.
Southerners complained that it was the North that was changing, and was prone to new "isms", while the South remained true to historic republican values of the Founding Fathers (many of whom owned slaves, including Washington, Jefferson and Madison.) The issue of accepting slavery (in the guise of rejecting slave-owning bishops and missionaries) split the largest religious denominations (the Methodist, Baptist and Presbyterian churches) into separate Northern and Southern denominations. Industrialization meant that seven out of eight European immigrants settled in the North. The movement of twice as many whites leaving the South for the North contributed to the South's defensive-aggressive political behavior.
Sectionalism has also existed in the American West. Farmers in the late 19th century, feeling exploited by railroads headquartered in the East, supported the Populist political movement.
Further reading 
- McPherson, James. "Antebellum Southern Exceptionalism: A New Look at an Old Question," Civil War History 29 (September 1983).
- Politics and Sectionalism in the 1850s
- Charles S. Sydnor, The Development of Southern Sectionalism 1819–1848 (1948)
- Robert Royal Russel, Economic Aspects of Southern Sectionalism, 1840–1861 (1973)
- Adam Rothman, Slave Country: American Expansion and the Origins of the Deep South (2005)
- Kenneth M. Stampp, The Imperiled Union: Essays on the Background of the Civil War (1981) p 198; Woodworth, ed. The American Civil War: A Handbook of Literature and Research (1996), 145 151 505 512 554 557 684; Richard Hofstadter, The Progressive Historians: Turner, Beard, Parrington (1969).
- Clement Eaton, Freedom of Thought in the Old South (1940)
- John Hope Franklin, The Militant South 1800–1861 (1956)
- Sydney E. Ahlstrom, A Religious History of the American People (1972) pp 648–69
- James McPherson, "Antebellum Southern Exceptionalism: A New Look at an Old Question," Civil War History 29 (September 1983).