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Germany pushes and the appeasement ends. Germany invades Poland and Australia becomes associates of the United Kingdom
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Italy declares war on France and Great Britain. After withholding formal allegiance to either side in the battle between Germany and the Allies, Benito Mussolini, Italian dictator, declares war again Japan the next day.
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Japan attacked the U.S Naval base at Pearl Harbor. The United States Congress declared war against Japan the next day.
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The Japanese launched its Pacific offensive with Thailand, Malaya, The Philippines and Pearl Harbor, Hawaii, all suffering attacks. A few days later, Australia's governor-general, Alexander Hore-Ruthven, declared Australia was at war with Japan.
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Britain and the U.S declared war on Japan. The nited Kingdom interest in the Pacific (Singapore, Australia and New Zealand) technically declared war on Japan before the U.S did.
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The United States declared war upon Germany, hours after, Germany declared war on the United States after the attack on Pearl Harbor by the Empire of Japan.