Assassination in Sarajevo

On June 28, 1914, an assassin's bullet set off a chain of events that would lead to the most terrible war the world had ever seen. This was the day Archduke Ferdinand, heir to the throne of Austria-Hungary, made a state visit to Sarajevo, the capital city of Bosnia. At the time, the Great Powers of Europe were heavily armed and ready for battle. When Gavrilo Princip stepped up to the archduke's car and fired two bullets, it lit the spark that would ignite World War I. Why was Franz Ferdinand killed? Who hatched the plot to assassinate him? And how did the assassination of an archduke lead to a world war that would claim the lives of millions?