Who said they did? Japanese troops did go into Korea that year.
America attacked Japan because of the sneak attack on Pearl Harbor on December 7, 1941. America was talking to Japan about peace when this occured and afterwards the U.S. launched a sneak attack on Japan and bombed Tokyo which showed that America was going to war against Japan.
The only time America attacked Japan is defending Pearl Harbour
America declared war on Japan and entered WW2.
After the second attack Japan surrendered.
America struck back after being attacked by Japan on 7 December 1941
it was a surprise from japan that they were not expecting
Serious but not so bad we had to sue for peace
Joy and elation that WW2 was finally over.
America declared war on Japan.
Bank of Japan was created in 1882.
The Unites States of America launched an attack on Japan called the Doolittle Raid. It was more to boost American morale than anything else.
The Japanese attacked America by aerially assualting pearl harbor the reason is i believe Germany put pressure on japan forcing japan to attack pearl harbor