12 Apr 1861—9 Apr 1865: Civil War The American Civil War was a civil war in the United States between the Union ("the North") and the Confederacy ("the South")
2
1914
28 Jul 1914—11 Nov 1918: World War I World War I, often abbreviated as WWI, was a global conflict fought between two coalitions, the Allied Powers and the Central Powers. Fighting took place throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia
1834 - 1918 (84 years)