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2 July, 23:57

Which event triggered the start of World War I in Europe?

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  1. 3 July, 02:21
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    The assassination of Archduke Franz Ferdinand caused a war between Hungary - Austria and Serbia. Many countries joined in because of the treaty alliance system; it was a bit like a chain reaction. WWI was declared on July 28, 1914.

    Hope that answered your question.
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