character: King Peter I of Serbia
topic: Serbia's response to the Austro-Hungarian ultimatum
grade: 9
subject: History
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character: Austro-Hungarian Empire
topic: The ultimatum issued to Serbia in 1914
grade: 9
subject: History
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character: Archduke Franz Ferdinand
topic: The assassination that led to the ultimatum
grade: 9
subject: History
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character: Serbian Government
topic: Negotiations and diplomacy following the ultimatum
grade: 9
subject: History
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