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Treaty of Versailles helps end World War I. US rejects the treaty and the power given to the League of Nations.
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The Nazi Party is formed, with Hitler giving emotional speeches between February and March. As an effective speaker, Hitler is named leader of the Nazi Party, earning the title der Führer.
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Hungary becomes part of the League of Nations. Hungary would later join Germany in World War II against the Soviet Union.
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The Soviet Union and Germany sign the Treaty of Berlin, which allow either country to remain neutral if one or the other is attacked by another country.
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Japanese assassins cause the death of Manchurian warlord Zhang Zuolin during the Huanggutun Incident. This increased tensions between China and Japan.
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Italy, Japan, the UK, and the USA agree to regulate submarine warfare and shipbuilding by signing the London Naval Treaty. Japan would later renounce their agreement under this treaty.
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Japan invasion of Manchuria signals the beginning of minor fighting of the Second Sino-Japanese War.
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Japan leaves the League of Nations. The reason Japan gave for withdrawing was because of accusations made against them regarding Manchuria by the League of Nations..
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Poland and Germany agree to sign the ten year German-Polish Non-Aggression Pact. The pact allowed Germany to maintain an eastern border. Five years after signing the pact, Germany invades Poland without much resistance.
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World War II begins when Nazi Germany invades Poland. France and Britain declare war on Germany.