Since the US wanted to stay out of the WW2 the Germans saw it as an opportunity to attack and put fear into the other nations so they could take over the world.
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Isolationism may have influenced extreme nationalism which in turn caused aspirations of conquest.
isolationism started in world war 2
World War 2.
Passive isolationism to global pro-activism
The Saar did not cause World War 2. It was returned peacefully to Germany after a plebiscite (referendum) in 1935.