Japan
Japan was impacted the most from this bombing. It was a huge devastation against their government. Many of the damages had to be fixed and the Government would fall apart from the end of the war. Construction on machines needed for the war would needed to be scraped and it would need to shut down any factories that were creating them.
United States
The United States would celebrate on its win of the War. They have completed on winning one of the most deadliest wars in history. However, fees would still be needed to pay and many soldiers would have to get back to living normal again. The government would later be run normally, but it started rough due to the difficulties with the Government.
Russia
Russia wasn't impacted much, but due to the thoughts of the United States building a bomb against them caused fear. It would cause the Atomic Race during the war. It was a panic in order to defend themselves from being bombed. Russia would continue to run normally up until the Cold War