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Gavrilo Princip assassinated Archduke Franz Ferdinand. Austria-Hungary thought Serbia was involved.
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Austria-Hungary didn't like the responses from Serbia to the document that was sent, so they officially declared war on them on July 28, 1914.
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The Battle of Tannenberg (first battle of the war) began on August 26, 1914. On November 11, 1919, Germany signed the armstice in France and all fighting ceased.
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Treaty of Versailles officially ended WWI.
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