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Archduke Franz Ferdinand, heir to Austria-Hungary's throne was assinated along with his wife Sophie. Serbian nationalist Gavrilo Princip while the couple were visiting Sarajevo.
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Unofficial Christmas truce was declared
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Lusitania sinks
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President Wilson issues his Fourteen Points to peace
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America declares war on Germany
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German flying ace, known as the Red Baron
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Act was used to enlist men ages 18-41
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Germany signs armistice at Compeigne, France.
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The treaty ends WWI