Who shot Archduke Franz Ferdinand?

Archduke Franz Ferdinand was shot by a Serb Bosnian student Gavrilo Princip. Gavrilo Princip was part of the Black Hand, a Serbian terrorist group with ties to Serbian military intelligence. 

His aim was to overthrow Austro-Hungarian rule in the Balkans and unite the Southern Slavic peoples into a federation. The first step to that goal, Gavrilo believed, was to assassinate the heir to the Austrian throne. The assaination of the Archduke and his wife would trigger World War 1.

For further reading check the following articles:

• World War I
• World War II
• Causes of World War I