28 jun 1914 año - The Austrian-Hungarian prince and his wife are assassinated in Sarajevo.

Descripción:

On the 28th of June Franz Ferdinand and his wife were assassinated in Sarajevo by a serbian nationalist terrorist group who were fighting against the Austria-Hungary's rule over Bosnia.
They were visiting Bosnia to inspect the Imperial troops stationed there, but it went terribly wrong. The Assassination of Franz Ferdinand and his wife was the direct cause of the FIRST WORLD WAR.

Sources: https://www.history.com/news/did-franz-ferdinands-assassination-cause-world-war-i#:~:text=Nationalism%20played%20a%20specific%20role,Austria%2DHungary's%20rule%20over%20Bosnia.&text=Entangled%20alliances%20created%20two%20competing%20groups.

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