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World War II was the biggest and deadliest war in history, involving more than 30 countries. Sparked by the 1939 Nazi invasion of Poland, the war dragged on for six bloody years until the Allies defeated the Axis powers of Nazi Germany, Japan and Italy in 1945. The principal belligerents were the Axis powers—Germany, Italy, and Japan—and the Allies—China, Great Britain, the United States, the Soviet Union, and France.
The following events occurred in September 1939: