The Southern states main product was cotton and tobacco and this required a large amount of labor to produce it. They did not see a better way to grow cotton. So for someone to take away their slave labor meant that they would lose their businesses and the economy would fail.
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Most wanted the south to continue to have slavery. Most were opposed to abolition. Most did not want it to spread at all.
Because it was the mainstay of the cotton industry, which represented half the exports of the USA.
South wanted to keep slaves, north didn't want slavery to continue
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The people of the southern America wanted the slavery to contending Abraham Lincoln won the civil war. the south agreed to free the slaves