The murder of Franz Ferdinand in Sarajevo is accepted by historians as the immediate cause of World War One though serious trouble – long term causes – had been brewing for sometime.On June 28th 1914, the heir to the Austrian Empire, Franz Ferdinand, was visiting Sarajevo, the capital of Bosnia.

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An extremist Serbian citizen assassinated the prince of Austria, Arch Duke Francis Ferdinand on 28th June 1914 in Sarajevo, the capital city of Bosnia. This was the immediate cause of the First World War. The assassination of the royal representative of Austria was an incentive for the nation to smother Serbia.
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please mark as the best answer Tanya61
what a answer! great job.