Answer:
Before WW2, the a large amount of people actually were in favor of isolationism. For example, there is a famous photo of George Washington with a swastica banner below the statue. Many people were in favor of isolationism because they didn’t believe that spending resources on the war would be benefical to the United States. On the other hand, there were in fact people who agreed with the Germans, both in their ideology of politics and even in some cases the genocides.