Why did conflict develop between Serbia and Austria-Hungary in the years leading up to World War 1?

Relations between Austria-Hungary and neighbouring Serbia had been tense in the years before the murder of the Archduke. Austria had long seen Serbia as a threat to the stability of its multi-ethnic empire. On 28 June 1914, a Bosnian-Serb terrorist shot and killed Archduke Franz Ferdinand, heir to the Austrian throne.

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