character: Bulgaria
topic: Alliances during WWI
grade: 4
subject: History
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character: Allied Powers
topic: Countries fighting against the Central Powers
grade: 4
subject: History
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character: Central Powers
topic: Countries including Germany, Austria-Hungary, and Bulgaria
grade: 4
subject: History
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character: Serbia
topic: A key player in the Balkan region during WWI
grade: 4
subject: History
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