character: King Peter I of Serbia
topic: Serbia's response to Austria-Hungary's ultimatum
grade: 12
subject: History
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character: Count Leopold Berchtold
topic: The role of Austria-Hungary in the ultimatum to Serbia
grade: 12
subject: History
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character: Nikola Pašić
topic: Political leadership in Serbia's response to the ultimatum
grade: 12
subject: History
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character: Archduke Franz Ferdinand
topic: The assassination that led to the ultimatum by Austria-Hungary
grade: 12
subject: History
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