Unilateral actions on the part of the states is not supported by the Constitution.
If the act of seizing property was a declaration of war, then why didn't Congress declare it when they were in session?
It certainly wasn't the actions of those desiring a peaceful solution.
The aggressor in war is not the first who uses force, but the first who renders force necessary.'
Why was use of force necessary at Sumter?
'[N]o State, without its Consent, shall be deprived of its equal Suffrage in the Senate.'
It certainly wasn't the actions of those desiring a peaceful solution.
No, it came after sending peace commissioners from SC, the Corwin amendment being blocked by republicans, the Washington Peace Conference failure, the Confederate Peace Commissioners sent 'to agree, treat, consult, and negotiate of and concerning all matters and subjects interesting to both nations' being rejected, etc.
Why was use of force necessary at Sumter?
Warships entering the harbor despite assurances from Lincoln to the contrary.