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September 18, 1931, Japan invades Manchuria. Preludes to WWII.
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July 7, 1937, Japan invades China, initiating World War II in the Pacific. It caused Japan to officially be considered in the war.
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September 29, 1938, Germany, Italy, Great Britain, and France sign the Munich agreement which forces the Czechoslovak Republic to cede the Sudetenland, including the key Czechoslovak military defense positions, to Nazi Germany. Giving Germany an advantage
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March 14–15, 1939, The Germans occupy the Czech lands in violation of the Munich agreement, forming a Protectorate of Bohemia and Moravia. Causing even higher tensions.
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September 1, 1939, Germany invades Poland, officially starting World War II in Europe. This pulled the final straw causing the all-out war to finally begin.
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July 10, 1940,The air war known as the Battle of Britain starts. Starts a major air battle.
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September 27, 1940, Germany, Italy, and Japan sign the Tripartite Pact. They now become known as the Axis.
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October 1940, Italy invades Greece from Albania on October 28. Greece is added to the Axis powers.
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October 31, 1940 The air war known as the Battle of Britain ends in defeat for Nazi Germany. First real victory aganst Nazi forces.
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November 20, 1940, Hungary joins axis powers. Two other countries also join.
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November 22, 1940, Romania join the Axis. Along with two other countries.
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November 23, 1940, Slovakia joins the Axis. Two other countries join
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December 7, 1941; Japan attacked Pearl Harbor causeing the US to join the war. US started interning Asian-Americans for fear that they were spies.
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May 13, 1943, axis power in Tunisia surrender to allied forces. Stops axis powers in North Africa
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June 4, 1944, Allied troops liberate Rome. Within six weeks, Anglo-American bombers could hit targets in eastern Germany for the first time. A breakthrough for the Allies, since they could now finally attack with a great amount of force with little casualties.
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June 6, 1944, US troops land on the beaches of Normandy to liberate the French and start a 2 front war
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April 16, 1945, Soviets lunch final offensive by encircling Berlin. An all-out attack to end the war and try to limit casualties by ending it quickly .
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April 30, 1945, Hitler kills himself before he can be captured
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August 6, 1945, US drops atomic bomb on Hiroshima.
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August 9, 1945, US drops the atomic bomb on Nagasaki, Japan.