I think B but I'm not sure if this is right. We are learning about this now (Im in 6th) in Social Studies. I hope I helped!
Because America was there 2nd goal the entire eastern side of the world was what they wanted to conquer first so if they dropped the bomb and japan sent there entire force at America say bye bye murica
Based on the bill of rights, popular sovereignty, personal responsibility and the power of the government.
Answer: There was a significant disillusion towards being able to assist Europeans and other nations in fighting off significant threats. At the same time, postwar disillusion in Europe resulted in a general rejection of the institutions and ideologies that plunged the continent into the worst of all wars.