Was the American policy of isolationism a factor in causing World War 2?

Answer 1

In my view, No. Germany did not anticipate that the US would involve it's self in a distant war, one whose ideology, (ie totalitarianism was more or less condonned), which it was very reluctant to do, and only the prior knolledge of a provoked and impending Japanese attack on the US fleet based at Pearl Harbor, allowed Roosevelt the necessary reason to bring the public 'on-side' by providing a massive and external threat to homeland security. Never the less, Hitler I think Herr Hitler lost little sleep over American involvement.