The Start of the Hundred Year War

After Avatar Roku's death, Firelord Sozin took advantage of the opportunity and launched a war against the other three nations, helped by the added strength given to firebenders by the Great Comet, which was renamed Sozin's Comet. His first step was to exterminate all the Air Nomads, since the next Avatar would be born there. Unknown to him, the Avatar -- a twelve-year-old boy named Aang -- had run away from home before the Fire Nation destroyed the Air Temples.

Avatar Aang was frozen in an iceberg for one hundred years, during which time the Fire Nation advanced its campaign nearly all over the globe. Only the Northern Water Tribe city, and the Earth Kingdom cities of Omashu and Ba Sing Se remained free from Fire Nation domination -- though Ba Sing Se came close to succumbing in a 600-day siege led by General Iroh of the Fire Nation.

Avatar Aang

After a hundred years trapped inside an iceberg, Avatar Aang was rescued by two Southern Water Tribe siblings: Katara (a waterbender) and Sokka (a nonbender). With his new friends, Avatar Aang set out to complete his Avatar training by traveling to the Northern Water Tribe to learn waterbending, with the goal of defeating Firelord Ozai (Firelord Sozin's grandson) before the return of Sozin's Comet at the end of the summer. In spite of being pursued by Admiral Zhao and the disgraced Prince Zuko of the Fire Nation, Avatar Aang managed to foil the Fire Nation's first attack on the Northern Water Tribe in more than half a century. However, even though the Fire Nation failed to conquer the Northern Water Tribe, they succeeded in conquering the Earth Kingdom city of Omashu.

Avatar Aang continued his training by finding an earthbending master, Toph Beifong. Avatar Aang and his friends discovered some important strategic information that could help the Earth Kingdom defeat the Fire Nation, so they made their way to Ba Sing Se and into Earth King Kuei's palace. Luck was not on their side, as the Earth Kingdom capital fell to a coup devised by Princess Azula of the Fire Nation. Avatar Aang was nearly killed in the struggle, but was saved by his friend Katara.

With the world thinking that he was dead, Avatar Aang and his friends organized an invasion on the Fire Nation capital for the Day of Black Sun, when a solar eclipse would temporarily block firebenders' abilities. But the Firelord knew about the invasion, and the invasion forces were easily defeated. Avatar Aang and his friends fled to the Western Air Temple, and they were followed there by Prince Zuko, who had also made plans for the day of the eclipse to confront his father the Firelord and change his loyalties for good. Prince Zuko then joined Avatar Aang and his friends.

The Hundred Year War officially came to an end on the day of the return of Sozin's Comet. On that day, the newly established Phoenix King Ozai launched a massive attack on the Earth Kingdom, but his efforts were thwarted by a multi-prong defense led by Avatar Aang and his friends: the secretive Order of the White Lotus, led by the former General Iroh, liberated the city of Ba Sing Se from the Fire Nation; the Phoenix King's airship fleet was destroyed by Sokka, Toph Beifong, and Suki, leader of the Kyoshi Warriors; Princess Azula was prevented from becoming Firelord by Prince Zuko and Katara; and finally, Avatar Aang defeated Phoenix King Ozai by using energybending to take his bending ability away.

After the War: The Founding of Republic City

With the war over, Earth King Kuei regained the throne of Ba Sing Se. The newly crowned Firelord Zuko and the Earth King came to an agreement to remove the Fire Nation colonies from Earth Kingdom territory, a project dubbed the Harmony Restoration Movement that Avatar Aang would personally oversee.

Tensions arose when Avatar Aang tried to relocate the people from the oldest Fire Nation colonies. Fire Nation colonials there had intermarried with Earth Kingdom people, and the many mixed families that existed didn't want to be uprooted or separated. As a way to solve the situation with minimal additional stress, Avatar Aang and Firelord Zuko founded the United Republic of Nations, and its capital Republic City. The idea was for the new city to become a melting pot of cultures, where people from all nations could live together in peace and harmony.

It is currently unknown if Republic City was at any point as peaceful and harmonious as its founders intended it to be. We know that Avatar Aang married his longtime friend Katara and settled down with his new family in Air Temple Island, a sanctuary he built himself. The massive statue of Avatar Aang that sits in Yue Bay was a gift from the Fire Nation, as a symbol of peace and goodwill. According to Tenzin, Avatar Aang's son and member of the United Republic Council representing the Air Nation, Republic City fell out of balance after Avatar Aang's death.

Avatar Korra's Time

Avatar Korra was born after Avatar Aang's death. Born in the Southern Water Tribe to waterbenders Senna and Tonraq, she turned out to be a very precocious child, bending three elements already by age 4. Avatar Korra trained in a closed compound at the South Pole, under the supervision of the Order of the White Lotus and Master Katara.

At age 17, having mastered waterbending, earthbending, and firebending, Avatar Korra left the South Pole and arrived at Republic City to begin her airbending training with Tenzin. There she found that, contrary to her expectations, not everyone was 'living it up' in the big city. The city is riddled with crime -- bending gangs that extort innocent shopkeepers. In her attempt to play good samaritan, Avatar Korra ended up doling out vigilante justice, which put her on the bad side of Chief Lin Beifong, head of the metalbending police force and daughter of Toph Beifong.

Republic City also has a growing anti-bending sentiment, a revolution being led by a mysterious masked man named Amon and his army of chi-blockers. But fortunately for Avatar Korra, not everything is grim in the city -- she manages to join a team participating in the exciting new sport of Pro-Bending, and she quickly befriends her new teammates, a pair of brothers named Mako (a firebender) and Bolin (an earthbender). Together, the three of them are the Fire Ferrets, and their goal is to win the Pro-Bending Championship. Will Avatar Korra be able to learn airbending, win at pro-bending, and take care of the anti-bending revolution all during her time in Republic City? Only time will tell.
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