World War I had its beginnings in a serious "disagreement" between rival groups within the Austro-Hungarian Empire, the dominant group and a handful of independence-minded groups which resented imperial control. When the tensions between these groups erupted into violence with the assassination of Archduke Ferdinand (a leader among the dominant group), World War I soon erupted, as well, with various nations coming to the aid of one or the other of the groups involved in the rivalry until nearly the entire world was at war.
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The Serbian assassination of the Austrian Archduke Ferdinand.
The submarine.
The assassination of the duke, Franz Ferdinand started it. It turned into a world war because everyone was pointing fingers at each other
the Moroccan king was killed and everything turned into a big mess
There were many occurrences that may have helped to formulate WW1. Most people believe that the main cause started with the assassination of Archduke Franz Ferdinand on June 28th 1914.