I am Grandfather. I will tell you a story of two kingdoms one kingdom wanted to destroy the other kingdom.
Yes, Fire lord Ozai.
Get the army we will destroy the Earth Kingdom.
To the Earth kingdom
What should we do?
What if they're coming for us next?
Will they kill us?
Many years ago the Fire lord Ozai planed out to destroy/takeover the Earth kingdom. Because the Earth kingdom, took fire people and rook over their rights.
Onwards to the capital city!!
Stop there! If you don't we will have to use force .
Fire lord Ozai and his army of fire people traveled to the closest Earth Kingdom. To take over the people in the land.
As you can see that is my story of the day.
Many of the Earth people moved to the capital for safety, but some people didn't make it in time. The Great capital city of the Earth kingdom was next. The Earth people were in fear of the Fire people.
As the Fire kingdom were about to reach the Earth kingdoms capital city, but were suddenly stopped by three people Aang, Katara, and Sokka.
In the end the Fire kingdoms army was destroyed and many have been hunted and killed. All of this changed both kingdoms. Both kingdoms made rules for the people. This still didn't mean everything was over for both kingdoms. One kingdom was planning war.