And by the way — that was one State. If the Union felt so irrevocably aggrieved by that one action that it was somehow compelled irretrievably into war. Then its war could only legitimately have been against South Carolina.
But I imagine everyone in hindsight can see that the Sumpter incident could and should have been quickly and peacefully resolved once the shooting there stopped. There was no legitimate call for a Northern invasion predicated upon that one incident.
Hey Ben are you defending the CSA and slavery or what?
The problem is that SC had joined the CSA, and that the attack on Sumter was launched by CSA forces, not SC forces.
You are also ignoring the dozens (minimum) of attacks launched on US forts and facilities by state and CSA troops throughout the South, including attacks on Fort Monroe and Harpers Ferry by VA troops before they had formally seceded.
For some obscure reason this never gets discussed. VA attacking USA troops and facilities over a month before it formally seceded. On what planet is that not treason, even if you believe in the right of secession?