That was in dispute with many believing that there never was a "CSA" as a legal entity.
Point being, it’s a little silly to claim Southern aggression started the war, when they were firing at US troops on Confederate territory. What were the US troops doing there if not committing a deliberate act of aggression themselves?
They were there as per orders defending a United States federal fortification.
“That was in dispute with many believing that there never was a “CSA” as a legal entity.”
Perhaps, but it’s not in dispute that the state of South Carolina considered it a legal entity. Doesn’t take a genius to realize if you insisted on stationed troops in their borders, THEY were going to view it as an act of war. This is one of those things where you don’t need a mutually agreed upon perception to make something a reality; one side’s perception is all it takes.