Answer :
The prime factor behind the outbreak of American civil war was rather economic than moral or political.
The northern and southern parts of the United States had fundamentally different economies in the middle of the 19th century, even though the country was going through a period of rapid growth. While agriculture in the North was largely confined to small-scale farms and manufacturing and industry were well-established, the South's economy was dependent on a system of large-scale farming that required the labour of Black enslaved people to grow specific crops, mainly cotton and tobacco.
Many southerners believed that the continuation of slavery in America—and hence the foundation of their economy—was in jeopardy as a result of growing abolitionist sentiment in the North following the 1830s and northern hostility to slavery's expansion into the new western territories.
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