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World War One period (1914–1918) 

• World War One period (1914–1918)

• Period of Finnish Civil War 1918

• Ireland: The Revolutionary Period (1916–1922)

• 1910 to c 1917 (Mexican Revolutionary period)

• 1917–1923 (Russian Revolutionary period)

• 1917 to 1921 (Period of the Ukrainian War of Independence)