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The immediate or proximate cause of war was the assassination on 28 June 1914 of Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne, by Gavrilo Princip, a Serbian nationalist. Austria-Hungary's resulting demands against the Kingdom of Serbia activated a sequence of alliances. Within weeks the major European powers were at war; their global empires meant that the conflict soon spread worldwide.

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Q: Who officially declared war to start World War 1?
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