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On 28th June 1914 Archduke Francis Ferdinand, heir to the Austro-Hungarian throne, was assassinated in Sarajevo by a Serbian nationalist (Gavrilo Princip). Convinced that the Serbian government had conspired against them, Austria-Hungary issued Serbia an unacceptable ultimatum. Serbia actually tried to comply, but falling short of the mark set by the Austro-Hungarians, this was seen as legitimate causus belli. This resulted in Austria-Hungary declaring war on Serbia on 28th July 1914.

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9y ago

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