Answer:
There are a couple of answers for this.
1. The U.S had made a lot of enemies. A lot of countries didn't like us anymore because we were helping other people.
2. We lost a lot of people. We lost so many people. WW2 is the deadliest human conflict to ever happen.
3. There were a lot of things wrong... the U.S were doing a lot of the same things that Nazi Germany was doing, concentration camp stuff, taking unnecessary risks, stuff like that. Our economy was so bad during those times because most of the U.S was out at war.
Step-by-step explanation:
Hope this helps you!!!