Actually, "shooting up" Ft. Sumter has been misunderstood.
Ft. Sumter was a firing range for Confederate Gunners. The Yankees made the mistake of standing down range :)
Noni....Who invaded who? The South didn't invade the North.
So the term "War of Northern Agression" is more acurate.
The U.S. wound up invading Japan and Germany in World War II. Does that make the U.S. the aggressor? Or where Germany and Japan the aggressors, regardless of invasion, because they initiated the war? The south resorted to war when they fired on Sumter. Having intiated hostilities you can hardly complain when war comes to you, now can you?