LOL! That's like saying only Hawaii was attacked by the Japanese so why bring everyone else in on it? When Sumter was fired on South Carolina it was part of the Confederacy and the order to fire was given by Jefferson Davis. The other six states were definitely a part of it.
Funny thing, in the Federalist papers, Madison and others belittled the idea that the militias of some states would send their armies to subdue other states.
And then came the Whiskey Rebellion.
They were a coalition, but they didn't take any personal action until the invasion. Then they supported the fellow members of the coalition.
But firing on Ft. Sumter was colossally stupid.
And then came the Whiskey Rebellion.
Yup. Just like the anti-federalists predicted. I've read both the Federalist papers and the anti-Federalist papers, and I from what I can tell, virtually every criticism made by the anti-Federalists turned out to be correct.