To me another factor leading to the Civil War was the North was closest to a Democracy which means "a mob." Democracy(a mob) needs a moral crusade to go to war and which preaches a doctrine of annihilation(Sherman!).
Sherman , however, was an admirer of the South. He knew that the only way to conclude the war was by a ruthless application of the sword. What the North cannot understand, and continues to put out of its mind to this day, was the extent of the physical damage in the South and why until this very day people in Georgia hate the names of Sherman and Lincoln. Freedom for the slaves is a shibboleth of the Liberal who seeks to justify his own hatred for —and now envy of the South.