Final answer:
The problem that led to the Civil War was slavery.
Step-by-step explanation:
One problem that led to the Civil War was slavery. The issue of slavery was a major point of contention between the Northern and Southern states. The North believed that slavery should be abolished, while the South relied on slave labor for their economy. This disagreement eventually led to the secession of the Southern states and the outbreak of the Civil War.
Learn more about Causes of the Civil War