US civil war

Civil War in four minutes. You can see the Southern states start shrinking after 1863. On July 4, Lincoln gave the Gettysburg Address, which reframed the war as the notion that the United States was founded on the proposition of liberty for all men.

There's also the thrilling Sherman's March to the Sea, which burned all of Georgia until the final battle at Savannah. The Confederate States, already split in two, were then split in three. Meanwhile, the casualties increased constantly.