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Austria-Hungary came together and decided to annex Bosnia and Herzegovina from the Ottoman Empire.
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The Arch Duke Franz Ferdinand was assassinated by Serbian nationalist named Gavrilo Princep. This started the power keg of Europe.
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Due to the assassination, the Austrian-Hungarian Empire declared a small war on Serbia.
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Germany officially declares war on Russia.
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Germany goes through and invades Belgium in order to get to France.
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The Germans successfully defeat the Russians while trying to invade Germany.
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An alliance was proposed with Mexico to start a war against the United States.
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The German U-Boats sink 3 American merchant ships due to problems between both countries.
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The U.S. enters in the first World War and works to declare war on all of the Central Powers combined.
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The German troops started to retreat from war due to rough conditions and not holding up well in the fight against the U.S.