When did Austria-Hungary blame Serbia for the death of Archduke

Archduke Franz Ferdinand of Austria and his wife Sophie are shot to death by a Bosnian Serb nationalist during an official visit to the Bosnian capital of Sarajevo on June 28, 1914. The killings sparked a chain of events that led to the outbreak of World War I by early August.

Explanation:

This Means This Was Near The Date They Got Killed, Less Then A Month Most Probably