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Japanese invasion of China was in 1937. Japan attacked China and successfully gained control over Manchuria. China did not fight back and Japanese had more troops.
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Germany’s invasion of Poland started in 1939 German forces invaded Poland. Adolf Hitler regain lost territory and ruled poland. This started World War II
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German Blitzkrieg was a strategy to do surprises attacks on people. The word “Blitzkrieg” means lightning war. The Germany used the Blitzkrieg strategy against Poland.
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Operation Barbarossa is a code name used by Nazi German. The code was used when German invaded Soviet Union during WWII in 1941.
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On December 7, 1941 Pearl Harbor, Hawaii was attacked by Japan. Americans led the US to join WWII. Japan used bombs, torpedo, and submarines.