What is the order of the civil war and how is the necessity it is?

Look the Civil War roughly, it starts with Abraham Lincoln’s idea which abolish the slavery and the south felt angry. The battlefield at first was the states in north-south junction. Along with the time, it boosted inward. The death is always with the war, someone might think there isn’t necessary to have the Civil war. If the Civil war didn’t happen, there would be a hard time to fix the unequal in south, even in the whole country.