| 1 | 1914 | - 28 Jul 1914—11 Nov 1918: World War I
World War I was one of the deadliest conflicts in history, resulting in an estimated 9 million military dead and 23 million wounded, plus up to 8 million civilian deaths from causes including genocide. The movement of large numbers of troops and civilians was a major factor in spreading the Spanish flu pandemic.
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1918 - 2007 (89 years)