The fugitive slave act and the Dredd Scott Decision preceeded the sesession of the southern states.
Total war is the idea that the enemy can best be defeated by attacking everything: soldiers, citizens, food, supplies, and more. ... The warfare conducted by ancient civilizations, such as Persia or Rome, and the modern warfare conducted by the Nazis during World War II are both good examples of total warfare.
Disagreements over state's rights, slavery, and other issues, the Civil War occurred when the tensions finally grew too much.