The American Civil War The Civil War was a brutal war between the North and South of America over the issue of slavery, which was spurred on by the secession of the southern states from the Union of a America. At the time slavery was one of the main issues in America that caused a disagreement between the north and south and these disagreements about humanity and slaves added to the tension that would finally lead to the out break of war. Slavery was almost totally abolished in the northern states after 1787 when the Constitution was drafted at the Philadelphia Convention and slavery was looked upon as the "peculiar institution" of the southern states, by the north. The southern states looked upon slavery as a way of life and were in no way prepared to give up what they felt was there property and a very important part of their cotton and farming production. Another implication that caused great tension between the north and south over the issue of slavery was that even though their were anti-slavery supporters in the south; some of the abolitionists of the north would write notices and say that all southerners were evil and cruel slave owners, who would treat their slaves badly. This angered the southerners who felt that the northerners were just being hypocrites and didn't know what they were talking about, which turned pro anti-slavery southerners into stronger supporters of the south. It was thought by some anti-slavery groups in America that slavery would die out because America had in 1808 stopped the participation in the international slave trade, which meant no supplies of new slaves would be coming in. But this theory proved wrong because slavery in the south began to expand due to the great demand of raw cotton from cotton mills of the Industrial revolution from overseas places like Britain. Also the cotton-based expansion of slavery came due to the invention of the cotton gin, by Eli Whitney in 1793, which cleaned the cotton plant and refined it on a mass scale.