Instead of an insult perhaps you could show jmacusa where he is wrong.
Jump right in, my time is limited.
I will take the time to note that the South didn’t invade the North until over 2 years into the war, hoping they could win a defensive war for what they saw as their territory. They were not trying to control the entire country, which would have made it a true civil war in the traditional sense of the term. They were trying to break away as their own group of states.