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The Assassination of archduke Franz Ferdinand on June 28th 1914 was the event that triggered the World War I.

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On July 28th 1914, a month after the assesination of the archdue Franz Ferdinand, Austria-Hungary declares war on Serbia.

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On July 29th 1914, Russia decided to mobilize troops in order to support Sebia.

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Germany gave the order to demobilize their troops. Russia asked Germany to negotiate the terms of the demobilization, but Germanuy refused and declared war on Russia.

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Germany attacked Luxembourg on August 2nd to consolidate their power in the region.

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The day after the attack on Luxembourg, Germany declares war on France.

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Germany declared war on Belgium, because Belgium refused to allow German troops to cross through their borders into France.

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On August 3rd Great Britain decides to mobilizes troops, because of the hostilities they did were to increase in the region.

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On August 4th Britain declares war on Germany because Germany declared war on Belgium, when Belgium had declared themselves neutral in the conflict.

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A state of war is declared at 11pm, because the Austria-Hungary empire rejects Great Britain's ultimatum over halting hostilities.