W.E.B. Dubois im pretty sure said that
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The atomic bombings of Nagasaki and Hiroshima.
He was captured and killed when he refused to surrender.
They refused to sell goods to them.
The surrender of Robert E. Lee and the Army of Northern Virginia at Appomattox on April 9th 1865. This was the biggest of the Confederate armies in the field, and its surrender is taken as the notional end of the war, although some smaller units were still in action for a few more weeks. There was never a peace treaty, because there had never been a declaration of war in the first place - Lincoln refused to recognise the Confederacy as a sovereign nation.
The first "battle" of the Civil War was the shelling of Fort Sumter. Fort Sumter was a fort on an island just off the coast of Charleston, South Carolina. It was held by US troops while the South seceded and formed the Confederacy. President Lincoln tried to send supplies to the fort, and the governor of SC demanded the troops surrender, before the supplies could arrive. When the troops refused, Confederate troops began shooting artillery at the fort. The Union troops in the fort tried to shoot back but didn't have enough troops or guns, so there was no way they could win. The fort surrendered after two days of shelling. Nobody was killed, but during the surrender ceremony, there was an accident that did kill a few men- the first casualties of a long and bloody war.