What issue mainly caused sectional tensions in the United States before the Civil War?

• A. Debates over tariffs in the North and South.
• B. Debate over the expansion of slavery into the West, which contributed to the Civil War.
• C. Conflicts over mining rights in the western territories.
• D. Disputes about state-funded education policy.

Answer: (B)

The key idea is how the spread of slavery into newly organized western territories created a deep split between free and slave states, shaping politics and society in a way that led to the Civil War. As new areas were admitted as states, deciding whether slavery would be legal there became a national crisis because it affected the balance of power in Congress and the future of the nation’s moral and economic system. Compromises like the Missouri Compromise, the Compromise of 1850, and the Kansas-Nebraska Act attempted to manage this disagreement, but they only offered temporary fixes and sometimes sparked more conflict, such as Bleeding Kansas, where people fought over slavery in the territories. This ongoing battle over slavery’s expansion mobilized political parties, policies, and eventually events like secession and the 1860 election, making the expansion question the central driver of sectional tensions. Tariffs and other issues caused friction too, but they did not define the sectional divide to the same extent as whether new lands would permit slavery.