Fire Nation-American War

"When the United States faces a new threat, then it's the Fire Nation. Ozai said that he would bring the USA down to its knees and kill Uncle Sam. That'll be a huge nightmare for us all. So if you don't want to get burned, then make sure that you can have fireproof suits in battle. Also, I'm thinking about being fireproof as well."

--Su Ji-Hoon, Fireproof Danger

The Fire Nation-American War is a conflict between the United States and the Fire Nation during World War III.

Also,it is where Zuko's Rebellion Army was born to restore new Fire Nation under Zuko's rule