Answer:
The assassination of Archduke Franz Ferdinand in Sarajevo on 28th June 1914, it triggered a chain of events that resulted in World War 1. After the assassination, Austria-Hungary threatened war on Serbia. ... At this point, Europe was at the brink of going to war.
Explanation:
World War 1 started when Archduke Franz Ferdinand of Austria was assassinated on June 28, 1914. This was the immediate cause but there were a series of events which triggered the war.
