World War I and the Treaty of Versailles didn't fix any of the problems going on the in world and even created more. World War II was fought over those old and new problems. So, yes, World War I caused World War II.
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NO it wasnt that long it was about 10-15 years when world war 2 started AFTER world on 1 . :)
the countries were fighting over toys
Hitler
they are related because the end of ww1 was actually the start if ww2