Slavery's economic effects sharpen sectional conflict

Slavery was the immediate cause of secession, while the economic system behind it sustained sectional conflict. Enslaved people lacked wages and consumer choice, narrowing the South's domestic market while northern industry benefited from wider circulation of income and demand. The map distinguishes states that seceded from slaveholding states that remained in the Union, avoiding a simple equation between slavery and the political decision to leave. Most white southerners did not own enslaved people, yet wealthy planters gained from coerced labour and reinforced an aristocratic political order. In this interpretation, economic self-interest strengthened some northern opposition to slavery alongside moral objections. The struggle over whether western territories would permit slavery therefore concerned political power, labour systems, industrial growth, and morality.