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World War II. When Germany invaded Poland on September 1, 1939 both England and France hesitated. Both nations pursued political solutions in an effort to stop Germany from continuing its attack. This proved to be useless and on September 3 the United Kingdom (England) Declared War against Germany as did France.
Germany invaded Poland on September 1 and on September 3, 1939 France and Britain declared war on Germany. However, despite the fact that the Allies did not declare war on Japan until December 1941, Japanese aggression included the occupation of Manchuria as early as 1931, and open war with China between 1937 and 1945.owever, it is officially accepted that World War 2 â¦ started when German troops invaded Poland on 1 September 1939. The United States entered the conflict after the Japanese attack on Pearl Harbour on 7 December 1941.