Answer:
Step-by-step explanation:
1. Isolationism: Many Americans wanted to stay out of foreign conflicts.
2. Memory of WWI: The trauma of World War I made them hesitant to enter another war.
3. Economic Struggles: They were dealing with the Great Depression and were wary of war's economic toll.
The attitude changed after:
1. Pearl Harbor: Japan's attack on Pearl Harbor in 1941 forced the US into the war.
2. Axis Threat: The Axis Powers aggression threatened global stability.
3. Moral Obligation: Atrocities by Nazi Germany prompted a moral duty to confront totalitarianism.
4. Economic Stimulus: War production helped boost the US economy and reduce unemployment.