What caused the start of WWII in Europe?

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There are two ways to answer this. 

First, WWII started in Europe because Germany invaded Poland.  When Germany did this, France and the United Kingdom declared war on Germany.  This started the war.

Second, we can look at the deeper causes that brought the war about.  The main cause was German anger over the Treaty of Versailles that ended WWI.  That treaty had been very harsh on Germany.  It caused many Germans to want to throw it off and retake their "rightful" status as a great power.  This helped bring Hitler to power and his aggressive foreign policy culminated in the invasion of Poland.

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