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High unemployment in Germany led to a desperation in the German population. This cause them to see the rise of someone like Hitler as a positive, as he promised them bread and jobs.

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Italy and Germany both fell under the sway of leaders who wanted to restore them to greatness, not caring for the side effects.

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Hitler knocked countries off one by one. France and Britain didn't get involved until Poland was invaded. The US didn't get involved until most of Europe had already been taken over.

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Germany wanted "lebensraum" or "living room" for the German nation, which required them to conquer territory around them.

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Europe didn't stand up to Hitler until it was almost too late
#Appeasement

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Germany (and Hitler more specifically) were angry about how World War 1 ended and wanted revenge.