Answer: USA emerged as a superpower alongside the USSR, but Britain was no longer a superpower, albeit still a powerful country. Yet the USSR and Britain had to rebuild their countries, which the USA did not.
Step-by-step explanation:
When talking about WWII, there are two theaters (European and Pacific) that are heavily talked about. These theaters, or warfronts, is where most of the fighting took place and hence there was catastrophic damage to the infrastructure of these countries (Britain and USSR that are located in the European theater), but not the USA as not real fighting took place there other than the surprise Pearl Harbor attacks.