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How did the revenge of austria-Hungary on Serbia lead to World War 1?

Answer:
A Serb assassinated Austro- Hungarian heir to the throne Archduke Ferdinand. Austro-Hungary petitioned Serbia to hunt the person responsible down. Serbia did nothing and so Austro-Hungary took revence and attaced them, in effect starting WWI
First answer by Czestochowa1734. Last edit by Czestochowa1734. Contributor trust: 410 [recommend contributor recommended]. Question popularity: 6 [recommend question].