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A Serbian terrorist group known as the Black Hand, led by Dragutin Dimitrijevic, murdered the Archduke and his wife when they were going to visit Bosnia's capital of Sarajevo.
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Austria-Hungary was upset at Serbia for the assassination of the Archduke. They published a set of rules that Serbia must compromise to. These rules were later called the Ultimatum.
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Austria-Hungary was still angry at Serbia for the assassination, and along with that Serbia posed as a threat against the Austria-Hungary empire.
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Germany had an alliance with Austria-Hungary, and when Russia was a threat to Austria-Hungary, Germany stepped in the war.
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Although France declared war on August 11th, 1914 the United Kingdom declared on the 12th of August, 1914. At this point alliances were joining to protect their allies, and this was the case here.
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A German submarine sunk the British cruise ship putting blame on Germany for killing innocent citizens.
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This event is small, but it greatly impacted the use of planes for the rest of the war
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Italy was on Germany's side, but since Italy switched the allies gained some power and the central lost some.
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Germany sends a notice to Mexico to influence the country of Mexico to fight the U.S.
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Since Germany started to come over the sea and influence Mexico, and Germany didn't stay on their side of the ocean, the U.S declared war.
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Since Austria-Hungary's close ties to Germany, the U.S declares war.
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Woodrow Wilson outlines his goals and peace goals he hopes to gain after the war in his 14 points.
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The countries that were involved in the war signed a treaty known as the Armistice to end World War 1.