Originally called the "Great War", biggest it was the biggest ever fought in one particular area. After WWII, it had to become WWI, otherwise people couldn't refer to WWII as WWII.
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The irony is the war didn't end all wars and the peace treaty that ended the War to End all Wars was a contributing cause of the Second World War.
The Great War The War to End All Wars
world war 2
The war to end all wars
The Great War or The War to End All Wars