In 1863, this day and tomorrow mark when the Confederate States of America ceased to be a possibility and became a doomed corpse. Yes, the Rebels lingered on for two more years while Union armies ground them into dust but their uncivilized cause was now totally hopeless.
July 3 - Gettysburg
Over 12,000 men began the charge, fewer than 6,000 came back in one piece. The Army of Northern Virginia was never able to recover. Lee continued fighting but all he could muster were defensive holding battles and fighting retreats. Lee managed a couple of marginal tactical victories but that didn't matter to Union commander Ulysses Grant. His plan was attrition, force Lee to fight until he literally ran out of men.
July 4 - Vickburg
reroute that mighty river to make the town's fortifications useless.
Finally, Grant settled on the strategy of starving the defenders into submission. On July 3, Confederate General John Pemberton asked Grant for his terms of surrender and on July 4 30,000 emaciated Rebel troops laid down their arms and surrendered. Vicksburg residents were so bitter about the siege and surrender that for 40 years after the Civil War they refused to celebrate Independence Day.