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Franz and his wife sophie were shot and killed by Gavrilo Princip
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Austria-Hungary declared war on Serbia. A few days later, Germany declared war on Russia to help its ally Austria-Hungary. Then France began to mobilize to help its ally Russia, and Germany followed by declaring war on France. World War I had begun.
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On 7 May 1915, the Lusitania was torpedoed and sunk by a German U-boat, causing the deaths of 1,198 passengers and crew.