Nuclear fission
China helped Japan alot after World War 2 they helped the economy a ton after the war and it made japan able to bounce back so quickly
Japan was a modern 20th century world power during WWII.
An increase in manufacturing.
Jet engines, rocket power and antibiotics
They helped defeat Hitler and they ended the war by dropping two bombs on Japan.
Japan's technology and the advanced use of it's fighter planes contributed to japan's strength the most. Japan's technology and the advanced use of it's fighter planes contributed to japan's strength the most.
Great Britain
The United States proper was not damaged or seriously affected by the First or Second World Wars. America helped to rebuild Europe, Japan & the Philippines after the Second World War.
airplanes
Japan attack on Pearl Harbor
After the bombings of Nagasaki and Hiroshima, the United States helped rebuild their country and economy that had been ravaged by years of war. Japan was although, disarmed. During the American occupation of Japan, they helped the Japanese adopt democracy and labor reforms. There were rapes by American soldiers, and there are other controversies regarding the occupation, but America truly helped rebuild Japan.
Hirohito was the Emperor of Japan during World War II, and until his death in 1988. Following World War II, he helped Japan get back on it's feet, and lead the country to being one of the greatest economic powers in the world.