character: Great Britain
topic: Joining the Allies in World War I to support Serbia
grade: 4
subject: History
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character: Serbia
topic: Ally of Great Britain in World War I
grade: 4
subject: History
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character: Germany
topic: Opposing force during World War I
grade: 4
subject: History
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character: Russia
topic: Support for Serbia and member of the Allies
grade: 4
subject: History
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