After the election of 1860, the Dred Scott court case, popular sovereignty, and more, America had hit it's breaking point. South Carolina, Florida, Alabama, and Mississippi were the first to leave followed by eleven more states. These states created the Confederate States of America.
The South was a huge economic factor in America. At one point, the South made over 50% of the worlds cotton. Plantations and cotton made America tons of money and losing them was not ideal for the North.The South influenced America's and the world's trade.