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The Hasburg Ultimatum was a document sent to Serbia from Austro-Hungary giving them terms to accept to prevent war, after a Serbian Terrorist Organization shot and killed the air to the throne to Austro-Hungary. Upon Serbia's refusal to sign the Hasburg Ultimatum, Austro-Hungary declaired war on Serbia, and invaded it. This was the spark to World War I, as immediatly after, Austro Hungary's ally Germany invaded Russia, Serbias ally.

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14y ago

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