PLEASE HELP IM SO LOST What events did the assassination of Archduke Franz Ferdinand trigger that led to war?

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.

they made rome the dominant power in the mediterranean.