I’d say the first act of aggression was caused in the Revolution by the British, and in the WBTS by the U.S. Case in point, Fort Sumter was sovereign Confederate territory, and once we had declared it as such, there was a responsibility on the part of the central government, to evacuate that fort.
The federal attempt to resupply the fort constituted an affront to the sovereignty of the C.S.A. and that should honestly be counted as the first “shot” of the war.
You are confusing the Revolutionary war and the Civil War.
Pardon me...I read it wrong.
My bad.