What was one significant problem that led to the Civil War?

Slavery was a significant problem that led to the Civil War because it was a deeply divisive issue in the United States during the 19th century. The nation was split between those who supported the institution of slavery, primarily in the Southern states where the economy relied heavily on slave labor for agriculture, and those who opposed it, predominantly in the Northern states where industrialization was more prevalent, and the moral arguments against slavery gained momentum.

The conflicts surrounding slavery manifested in various ways, including political disputes over its expansion into new territories and states, social tensions arising from differing views on human rights, and economic rivalries based on the differing labor systems. The election of Abraham Lincoln, who was viewed by Southern states as a threat to slavery, further heightened tensions and contributed to the secession of Southern states from the Union, ultimately leading to the outbreak of war.

Other options, while they played roles in the broader context of the period, were not the central issue that sparked the conflict in the way that slavery did. Federal taxation and immigration policies, for example, were less contentious and did not drive wedges between the states as fiercely as the issue of slavery did. Economic expansion is a broader theme that encompasses various aspects of growth and development in the country,