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Germany, Austria-Hungary, and Italy become allies.
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THe First Olympic Games since Ancient Greece are held in Athens, Greece.
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The World's Fair is held in commemoration of the signing of thre Louisiana Purchase
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Great Britian, France, and Russia form an alliance in response to the formation of thre Triple Alliance between Germany, Austria-Hungary, and Italy.
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Archduke Franz Ferdinand of Austria, heir to the throne of Austria-Hungary, and his pregnant wife Sophie are assassinated in Sarajevo, Bosnia, by a Serbian man named Gavrilo Princip, a member of the Black Hand.
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Austria-Hungary declares war on Serbias after a Serbian kills Archduke Franz Ferdinand, beginning World War I.
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Albert Einstein publishes his theory of special relativity, one of his most famous scientific discoveries.
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Congress declares war on Germany at the request of President Woodrow Wilson due to Germany's use of unrestricted submarine warfare and attempts to get Mexico to attack the US.
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The Treaty of Versailles is signed, levying large penalties on Germany, who was blamed for the war.
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The 19th Amendment is ratified, giving women tin the US he right to vote for the first time.
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The crash of the US stock market, known as Black Tuesday.
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Japan invades Manchuria to obtain resources.and expand the nation to help relieve the economic crisis.
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Fascism rises with dictators, such as Adolf Hitler, who come to power as countries recovering from the Great Depression
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Franklin Delano Roosevelt is inaugurated as the 32nd President of the United States, in the height of the Great Depression.
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Congress passes President Roosevelt's plan to fix the economy during the Great Depression.
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Prohibition is repealed due to the huge dislike of the Amendment by the American people and the impact on society, such as increased organized crime.
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Germany invades the Rhineland without resistance from Britain and France, who hoped to prevent war.