What caused the major economic conflict between the North and the South immediately before the outbreak of the Civil War?

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Agricultural development in the South relied heavily on slave labor, while industrialization in the North led to the growth of the abolitionist movement. This fundamental difference in economic structures and the morality surrounding slavery created a major conflict between the regions. The South also felt that the North's tariff policies unfairly benefitted their industries at the expense of Southern agricultural exports. Additionally, tensions over the expansion of slavery into new territories further exacerbated the economic conflict.

What Caused the Major Economic Conflict Between the North and the South