What was the 5 reasons of the American Civil War?

Most people think the cause of the civil war was slavery. It wasn't. When Lincoln won the election the southern states were afraid he would abolish slavery, but the true issue was state rights. They felt they had the right to decide the issue of slavery for themselves. Lincoln disagreed since he argue that this was a "united" States. On April 12, 1861 the first shots were fired in South Carolina at Ft. Sumter a union fort in Charleston Bay. The fort had become a symbol of national sovereignty in the Confederate States because Lincoln wanted to maintain the fort, in the hope that a reaction toward Unionism in those states would eventually bring them back. This sparked 4 years of war in which at least 620,000 American soldiers lost their lives. It was mostly because of slavery though.