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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.
Britain and France declared war on Germany over  the German invasion of Poland, but nobody declared war on the  Soviet Union when they did exactly the same thing a few weeks  later.One massive war at a time, I guess.his is what led to the German invasion of, and declaration of war on, Poland on September 1st. On September 3rd, the British and French, stunned by the boldness of Hitler (they had not expected him to actually attack), declared war on Germany, as per the agreement they had made with Poland.