For 10 points, name this event that sparked World War I, in which an heir to the Austro-Hungarian throne was killed in Sarajevo.
In the aftermath of this event, an "ultimatum as had never been written in modern times" was made that was designed to be rejected. This event which led to the July Ultimatum was organized by a group led by a man nicknamed Apis. A bomb was thrown under a car during this event, injuring 20 people but not killing the (*) intended occupants. This event was planned by Danilo Ilic, a member of the Black Hand, and was perpetrated by Gavrilo Princip in Sarajevo, the capital of Serbia. For 10 points, name this event that sparked World War I, in which an heir to the Austro-Hungarian throne was killed in Sarajevo.
In the aftermath of this event, an "ultimatum as had never been written in modern times" was made that was designed to be rejected.
assassination of Archduke Franz Ferdinand (accept reasonable equivalents)