Explore 1919-01-21
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Mexican Revolution 1910-11-20 - 1920-12-01
Russian Revolution 1917-03-08 - 1923-06-16
Russian Civil War 1917-11-07 - 1923-06-16
German Revolution 1918-10-29 - 1919-08-11
Polish–Ukrainian War 1918-11-01 - 1919-07-18
Biennio Rosso 1919-01-01 - 1920-12-31