Final answer:
The main cause of the Civil War was the issue of slavery, with the southern states supporting it and the northern states advocating for its abolition.
Step-by-step explanation:
The main cause of the Civil War was the issue of slavery. The Confederate states believed in the right to own slaves and wanted to preserve the institution, while the northern states believed in the abolition of slavery. This fundamental difference in ideology and a desire to maintain economic and political power led to the secession of the southern states and the eventual outbreak of the Civil War.
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