Important Dates 1917-1939 By 157807 Period: Jan 1, 1917 to Dec 31, 1940 Important WWII dates 1917 - 1939 the important dates leading up to, and during world war 2 Feb 7, 1917 communist revolution in russia Feb 11, 1919 the comintem Feb 11, 1923 radio broadcasted Feb 11, 1924 new leader of the USSR Feb 11, 1927 jazz singer Feb 11, 1929 market crash Feb 11, 1933 hitler takes command Feb 11, 1939 world war 2