WWI was started by a variety of events that compacted together essentially bringing Europe to it's knees. If you want to be technical about it the lone event that triggered the war would have to be the assination of Arch Duke Ferdinand. A man by the name of Gavrilo Princip was the assian and a member of the black hand, which was a group of Serbian nationalists.
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No, the assassination of Archduke Ferdinand started the war.
World War 2 started.
The Germans started both wars.
The first world war started after the assassination of Duke Franz Ferdinand.
he was assinated and that started world war one.