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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.
TAGS: None. The typical date agreed upon by historians to answer the question of when did World War 2 start is September 1st, 1939. This is the date that Germany invaded Poland; however, France and Great Britain did not declare war on the Germans until September 3rd.