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    One of the 100 questions in this topic

    How much do you know about World War I?

    What event triggered the start of World War I?

    Answers

    The sinking of the Lusitania
    The assassination of Archduke Franz Ferdinand of AustriaCorrect
    The invasion of Poland
    The Balkan crisis

    The assassination of the heir to the Austro-Hungarian throne in Sarajevo by a Serbian nationalist was the immediate trigger.

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