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World war one: 1914-1918 World war two: 1939-1945
world war 1 started July 28th 1914 and world war 2 started 3rd September 1939
The world war 2 started on September 1, 1939 to September 2, 1945.
World War I as a declared state of war lasted from July 28, 1914 to November 11, 1918.
Russia joined world war 1 in 1914