World War I (WW1) Facts, Worksheets, History & Information
Jun 26, 2020 · The war lasted exactly four years, three months and 14 days. Before World War II began in 1939, World War I was called the Great War, the World War or the War to End all Wars. 135 countries took part in World War I, and more than 15 million people died. See the fact file below for more information about World War I.
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