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There was an explosion on Japan railways so Japan claims that the Chinese invaded their railway, so they decided to attack China.
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After Japan was blamed for the events in Manchuria, which they idi do, they deciced to leave the League of Nations (https://www.upi.com/Archives/1933/02/24/Japan-stuns-world-withdraws-from-league/2231840119817/)
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After Hitler were made chancellor, he decided to withdrawl from the League of Nations because they wouldn't allow them to have a military. (https://www.wdl.org/en/item/11598/)
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Laws were passed from 1935-1939. The prupose was to limit the US involvement in foreign conflicts.(https://www.encyclopedia.com/history/encyclopedias-almanacs-transcripts-and-maps/neutrality-acts-0)
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The Marco Polo Bridge incident led to China and Japan going into battle. China fought with the help of the US and the Soviet Union. (https://en.wikipedia.org/wiki/Second_Sino-Japanese_War)
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Also called "Anschluss", which meant the annexation of Austria. The idea was to form a Greater Germany and make them even more powerful than what they were. (https://en.wikipedia.org/wiki/Anschluss)
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Included Germany, Great Britain, France, and Italy. This agreement meant that Germany could annex Sudetenland in western Czechosylvakia. (https://www.britannica.com/event/Munich-Agreement)
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Hitler, Mussolini and a few others came together and signed a pact to take over Czechosylvakia and give it to Germany.(https://www.history.com/this-day-in-history/nazis-take-czechoslovakia)
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Before WWII the Nazi Germany and the Soviet Union came together and made the Non-Aggresion Pact, which meant they were to not fight eachother for the next 10 years. Hitler and Stalin used this pact to two totally differnt reasons. (https://www.history.com/topics/world-war-ii/german-soviet-nonaggression-pact)
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Hitler's military invaded Poland by land and air. There was extensive bombing. There were lots of troops and tanks on land.Polish forces were not equipped enough to beat Germany. Hitler says it was a defensive attack. (https://www.history.com/this-day-in-history/germany-invades-poland)
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France decided to surrender to Germany before Germany invaded western Europe. Germany defeated allied forces in 6 weeks, Italy decided to get involved and help defeat France. (https://en.wikipedia.org/wiki/Battle_of_France)
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French signed an armistice and quit WWII, so Britain was left alone in the war against Germany. Great Briatin defense helped them defeat Germany.