Invading Japaneses- held island in the pacific
Obviously, they tried to defeat their enemies, the Axis Powers. If you wanted a different answer, you should rephrase your question.
The allied powers.
They were tried as war criminals and hung.
Southern States.
US actions in the face of Japanese aggression was limited to economic sanctions, and the other Allies also tried to limit the acquisition of war materials by Japan.
Japan
The British Army during the War of 1812.
During WWII, all of those mentioned above tried to help the allies. UN- supported allies Marshall Plan- backed up war-stricken WWI nations recover NATO- alliance of the allies Get the idea. Each tried to support the allies win the war and gain more support
Japan but they failed...epicly
This would most likely cause a very intense war with Japan, since they would know that we tried to wipe out 2 of their biggest cities. Luckily, this did not occur, and now Japan is one of America's biggest allies.
Ditto i tried it
Some people helped individuals during the Holocaust. Nobody tried to 'prevent the Holocaust' - even the Allies did not try to do that.