Assassination in Sarajevo - Source picture: Wikipedia
When Archduke Franz Ferdinand and his wife Sophie were assassinated in
Sarajevo on June 28th. 1914, this would cause a huge conflict.
See also my blogpost: Remembrance Weekend - Start World War I
Initially the people in Vienna were indifferent to what had happened but
Emperor Franz Joseph of Austria wanted a complete investigation of this
tragic event. A lot of diplomats tried to find a solution. Meanwhile War
Coalitions were made.
Franz Joseph of Austria - Source picture: Wikipedia
After Serbia rejected the conditions of the ultimatum (the text of it was drafted
in very hurtful terms), Austria declared war to Serbia on July 28th. 1914.