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In 1914, Gavrilo Princip killed Archduke Francis Ferdinand, heir to the throne of the Austro-Hungarian empire.
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Austria-Hungary issued an ultimatum to Serbia. The Austrians didn't like Serbia's response. They went to war.
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Germany declared war on Russia, France, and Belgium. Austria declared war on Russia and Belgium. Britain declares war on Germany and Austria. Japan declares war on Germany.
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All the battles occurred in this time period.
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The peace conference opened in paris
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The league of nations was accepted.
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The treaty of Versailles was signed
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Germany and the United Kingdom ratifies the treaty of Versailles.