First, noting DiogenesLamp's previous observation that agreements made under duress are not considered legally valid: both agreements, by Union forces at Forts Pickens and Sumter were made under duress, and threat of military action by Confederates.
Such threats and actions, when carried out, make the Confederacy the aggressor power which started Civil War.
Second, it may be a fine point of language, but Winfield Scott's April 4 order to "reinforce" Fort Sumter was eventually changed to just "resupply" Sumter, so long as there was no Confederate resistance.
Any claim that these actions were "declarations" or "acts" of war are equivalent to saying US resupply / reinforcement missions to Guantanamo Bay are "acts of war" against Cuba.
In both cases a decision for war is purely that of the aggressor power, be it Cuba or the Confederacy.
Number 5. Why don't you try reading the series of messages showing how the Union sent a fleet to invade? You would sound more sensible if you just challenged the truth of it. At least it would indicate that you have some grasp of the concept.