The civil war was fought between two sections of American society over a number of issues. The southern states of the United States were predominantly pro slavery. There was a sense of insecurity prevalent in southern society over the issue of slavery and the rising abolitionist stance of North. They accused northern states of not doing enough to preserve their rights and deliberate attempts to abolish slavery in United States.
After the success of Abraham Lincoln, a known anti slavery politician from Republican Party, many Southern States saw no future with the Union and decided to secede. By February 1861, seven states had already seceded. The North, led by Lincoln, wanted to remain as a united country and decided to wage war against rebel states. The civil war thus started in 1861 and continued unabated until 1865.