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The assassination of Archduke Franz Ferdinand angered Austria.

Nationalism increased tensions in the Balkan peninsula.

Alliances caused a chain of events that pulled each country into war.
the outbreak of world war 1 occurred on june 28,1941,when archduke franz  Ferdinand, heir to the Austro-Hungarian Empire, was shot to death with his wife by the Bosnian Serb nationalist Gavrilo Princip in Sarajevo.
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