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Hitler organizes a plan called "blitzkrieg". It was also extended bombing early to make the Polish scared before they actually began to take war on them.
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The Japanese go and bomb Pearl Harbor. This event caused a lot of commotion between the two countries. The Japanese wanted to hit us where it would hurt the most.
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They had devised a plan to go and attack the Alllies. They were waiting for the right day to do it and D-Day just happened to be it.