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Germany invades and defeat Poland, starting a streak of dozens more countries to be invaded and defeated by Germany. Sparking Britain and France to declare war on Germany shortly thereafter. Photo from Britannica https://www.britannica.com/event/World-War-II
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The official forming of the Axis powers, Italy, Japan, and Germany. This is pertinent because it officially signifies the alliance between the three countries, truly starting a full-blown World War II. Photo from Wikimedia Commons https://commons.wikimedia.org/w/index.php?search=Axis+Powers+WWII&title=Special:MediaSearch&type=image
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The infamous bombing of Pearl Harbor Hawaii done by Japan, sparked the US declaring war on Japan. Also lead to Italy and Germany declaring war on the US. The most important event in the US becoming involved in WWII. Photo from Wikimedia Commons. https://commons.wikimedia.org/wiki/File:Japanese_aircraft_attacking_Pearl_Harbor,_1941.jpg
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The invasion of Normandy Beach, France. This lead to the allies eventually liberating France, which in turn was a massive turning point within the War. Photo from Wikimedia Commons https://commons.wikimedia.org/wiki/File:Into_the_Jaws_of_Death_23-0455M_edit.jpg
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The US drops two bomb on Hiroshima and Nagasaki, finally forcing Japan to surrender officially ending WWII. Photo from Wikimedia Commons https://commons.wikimedia.org/wiki/File:Little_Boy_bomb.jpg