Basically, all of European and Asian economy was more or less ruined after the War while the United States were safe because their land was not destroyed. This was combined with the baby boom generation when suddenly a lot of young people began working and since the US was exporting like never before they needed factories and workplaces filled.
Here maybe this will help https://www.history.com/this-day-in-history/the-hitler-stalin-pact
Answer:
D, oil was discovered on the Arabian peninsula.
