Which of the following was a central issue of the Civil War?

• A. Tariff policy in the 1830s
• B. Naval power in the Atlantic
• C. Slavery and its expansion into new territories
• D. Women's suffrage movement

Answer: (C)

The main idea here is that slavery and its expansion into new territories and states defined the major political and moral divide before and during the Civil War. The Southern states depended on slavery for their economic system and social structure, while many Northern leaders and abolitionists argued against letting slavery spread into new areas. As new states and territories debated whether to permit slavery, sectional tensions intensified, influencing party politics, laws, and national leadership choices. The election of leaders who opposed expanding slavery and the subsequent move toward secession showed how central the issue of slavery was to the conflict. Other topics, like tariff debates in the 1830s, naval power, or later movements for women's suffrage, were important in their own right but did not lie at the heart of what caused the Civil War.