From "Avatar: The Last Airbender: Sozin's Comet: Part 4 - Avatar Aang (#3.21)"
Today, this war is finally over.
I promised my uncle that I would restore the honor of the Fire Nation, and I will. The road ahead of us is challenging. A hundred years of fighting has left the world scarred and divided, but with the Avatar's help, we can get it back on the right path and begin a new era of love and peace.
[Zuko bows down. The High Sage crowns Zuko
All hail Fire Lord Zuko!