"On June 28, 1914, Franz Ferdinand was in Sarajevo, the capital of Austria-Hungary's province of Bosnia-Herzegovina. After a bomb attack failed earlier in the day, Gavrilo Princip, a Bosnian Serb nationalist, fired two pistol shots into Franz Ferdinand’s car. The shots killed the archduke and his wife, Sophie. On July 28, Austria declared war on Serbia, triggering World War I."
Franz Ferdinand. (2016). In World Book student. Retrieved from http://www.worldbookonline.com/student/article?id=ar753702