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Hitler invaded Poland on September 1, 1939 then Great Britain and France declare war on Germany two days later. This was the start of WWII
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Churchill because the Prime Minister of Great Britain and also Britain has a battle victory against Hitler, which causes him to postpone his invasion plans. This is important because it marks the first setbacks on Hitlers behalf.
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Japan attacks Pearl Harbor in Hawaii. Pearl Harbor was an important U.S Navy base. The next day, FDR declares war on Japan. This is important because it marks the intervention of US in WWII
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Germany surrenders at Stalingrad, which marks their first major defeat. Italy also surrenders, but Germany takes over the battle for them. This is important because it shows Hitler is being weakened.
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USA and Allies invade northern France. Paris is liberated and many concentration camps as well. This is important because it was the first time all three Allies attacked the same country on different fronts.
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Auschwitz is liberated by Soviet troops. Auschwitz concentration camp was a network of concentration and extermination camps built and operated by Nazi Germany in occupied Poland during World War II. This shows that troops are beginning to save people and end the Holocaust.
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Truman becomes President of the US on Roosevelt's death, and Attlee replaces Churchill. This marks the change of war strategies in WWII.
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On August 6, 1945, during World War II, an American B-29 bomber dropped the world's first deployed atomic bomb over the Japanese city of Hiroshima. This is important because it shows the US innovation of nuclear weapons.
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Japan announces their surrender after the second atomic bomb was dropped in Nagasaki, Japan.