Harmony Restoration Movement

The Harmony Restoration Movement was a movement to remove the Fire Nation presence in the Earth Kingdom by transferring the Fire Nation colonials back to the Fire Nation. It was proposed by Avatar Aang at Earth King Kuei's re-coronation ceremony, and was greeted with cheers from the Earth Kingdom citizenry. However, the movement eventually led to a conflict between Earth King Kuei and Fire Lord Zuko, mediated by Avatar Aang.

Background
Before the beginning of the Hundred Year War, Fire Lord Sozin occupied Earth Kingdom territories and transferred Fire Nation citizens to the area. When Avatar Roku confronted him about it, Sozin attacked, but was defeated. Roku ended the colonies, but following Roku's death, Sozin reestablished the colonies. As the War continued, more land was occupied and more towns were formed. These practices continued through the reign of Fire Lord Ozai.

Immediately following the end of the War, Zuko, Aang, and Kuei met to discuss restoring peace. Zuko pledged to rid the Earth Kingdom of the colonies at all costs while Aang volunteered to ensure everything goes peacefully. The process started without incidents for nearly a year, as many residents of the newer Fire Nation colonies were eager to return home. However, problems arose when it come to disbanding the older colonies, forcing Fire Nation residents to abandon the only homes they had ever known. Tensions quickly rising, an assassin made an attempt on Zuko's life. When she revealed herself to be the daughter of the Mayor of Yu Dao, the oldest colony in the Earth Kingdom and the center of the resistance, Zuko decided to personally head down there and remove the colony.

Conflict
Invited by Mayor Morishita and his wife to spend some time in the colony, Fire Lord Zuko noticed how intertwined the citizens of both nations had become by working together, living in the same neighborhoods, and even intermarriages. This led Zuko to abandon the movement and to believe that reforming the colonies was a better and less disruptive solution than total abandonment. He barricaded the city, announcing that no one was to leave or enter the city without his permission. When Aang arrived, he and Katara were attacked by several firebending guards, only ending when Zuko bound Katara with hopes of making the duo give up. The arrival led to a scuffle, during which Zuko agreed to another talk with Earth King Kuei in hopes of achieving future peace.

As Aang was leaving Yu Dao, he met up with Smellerbee, Longshot, and Sneers, who explained the situation. Smellerbee was angry at Aang's decision to support peace and gave Aang an ultimatum: complete negotiations within three days or the Freedom Fighters would attack Yu Dao.

To come up with a peaceful solution, Aang and Katara traveled to the Earth Kingdom Royal Palace with the purpose of inviting the Earth King to a negotiation with Fire Lord Zuko. However, Earth King Kuei, determined to make up for his weak ruling of his nation in the past, refused such a meeting and immediately ordered General How to send troops to Yu Dao to reclaim it by force. His military campaign did not pass the Fire Lord unnoticed and Zuko led his armies toward Yu Dao as well. These events further complicated the movement.

Trivia

 * The name of the movement was devised by Sokka.