‘Actually, I’d say they had numerous chances to win the war, but failed to capitalize on them, the last time being Chancellorsville.
Buy the time of Chancellorsville the South had been cut in half at Vicskburg,’
Chancellorsville was fought on May 1st and 2nd, 1863.
The Seige of Vickburg didn’t being til June 18th, 1863.
And didn’t end til July 4th, 1863.
But by that time oc Chacellorsville Grant had already crossed the river. The Union held the west bank of the Mississippi across from Vicksburg, the river above and below Vicksburg, and Grant's army was maneuvering against Pemberton east of Vicksburg. The confederacy was, for all practical purposes, cut in half months before Vicksburg acually fell.