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Hitler invades Poland on September 1st. This caused Britain and France declare war on Germany two days later.
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Winston Churchill becomes Prime Minister of Britain on May 10th, 1940. This happened when he was called to replace Neville Chamberlain.
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Hitler begins the invasion of the Soviet Union on June 22nd. Operation Barbarossa was the code name for the operation.
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Mass murder of Jewish people at Auschwitz also begins on June 22nd. Operation Barbarossa was a turning point and resulted in the death of over 1.5 million Jews.
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Japan attacks Pearl Harbor on December 7th. This is the point where the United States enters the war.
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Singapore falls to the Japanese on February 15th. Around 80,000 British, Indian and Australian troops joined the 50,000 already taken and became prisoners of the war.
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American naval victory at Battle of Midway happened on June 4th. This battle marks a big turning point in the Pacific War.
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The Battle of Stalingrad took place on August 23rd. The surrender marks Germany's first major defeat.
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Auschwitz liberated on January 22nd. The Soviet army entered Auschwitz and liberated the remaining prisoners, who were mostly ill and dying.
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Henry Truman becomes President of the US on April 12th. This happened upon the death of Franklin D. Roosevelt.
