What was the catalyst to World War1 ?
The act that sparked the hostilities was the assassination of Archduke Ferdinand of Austria.
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The catalyst to World War 1 was the assassination of Archduke Franz Ferdinand of Austria-Hungary. This event took place on June 28, 1914, in Sarajevo, when the Archduke and his wife were shot by a Bosnian Serb nationalist named Gavrilo Princip.
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