American civil war is the main cause of the conflict of interests occupy intensified. American independence, particularly in the expansion of the northern territory, industrial capitalism and southern plantations along the path of different economic economy have been developing rapidly. However, the more sharp contradiction. Both sides of the conflict is mainly manifested in the new development of west of the land of slavery and waste problem. Both sides of the western land for economic reasons but also is to increase their seats in parliament, which affects the federal government's policy, at the same time, using the slavery, the owners of labor, and occupied by the capitalist economic development but requires a lot of cheap "free" hire labor. The mid 19th century, north-south contradictions in the black slavery or abolish the contradiction, intensified, led to the American civil war.
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