The Civil War (21h 31min, apr 12, 1861 y – 5h 7min, may 9, 1865 y)
The Civil War was a war on slavery in the United States, separating the nation by confederate and union states. During the war, "greenbacks" or the "fiat currency" of the time was introduced, and is still used as a slang erm for dollar bills.
Added to timeline:
The History of the American Banking system