It began on April 3, 1861 when Lincoln launched warships (Powhatan, Pocahontas, Pawnee, Harriet Lane, the Yankee, the Nashville, Uncle Ben, the Baltic and others) to attack the confederates at Charleston, and to whom copies of the orders to attack them had been passed.
Had Lincoln not sent those ships, they would have felt no need to neutralize the fort, and Major Anderson himself would have evacuated it had he just a few days more time before the conflict began.
But that is history they don't teach, and you have to go to a great deal of trouble to find it.
Far more comforting to some is the belief that the good guys beat the bad guys and that the bad guys were bad.
DiogenesLamp: "It began on April 3, 1861 when Lincoln launched warships (Powhatan, Pocahontas, Pawnee, Harriet Lane, the Yankee, the Nashville, Uncle Ben, the Baltic and others) to attack the confederates at Charleston, and to whom copies of the orders to attack them had been passed."
DL, you well know better, but refuse to acknowledge that:
In February 1861 Jefferson Davis promised he would start war if he thought Confederate "integrity" was "assailed".
In March 1861 President Lincoln promised he would not "assail" and so Confederates could only have war if they themselves started it.
At Fort Sumter, in April 1861, both Davis & Lincoln kept their promise.
In sum, Confederates were military aggressors against Union troops in Union Fort Sumter, thus starting Civil War.
All of which DiogenesLamp well knows, but refuses to acknowledge.