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After the conclusion of The War, Aang and Zuko brought people from the four nations together and founded the United Republic, creating Republic City a large "metropolis powered by steam punk-type technology" such as cars and motorcycles. Aang and Katara had three children, the youngest of which is Tenzin, an airbender. Meanwhile, Toph Beifong traveled extensively to teach metalbending. After Aang's death, the next Avatar, Korra, was born in the Southern Water Tribe.
At the present time, seventy years after the end of the War, Korra is a rebellious seventeen year-old girl. As the Avatar, she has already mastered waterbending, earthbending, and firebending. At the beginning of the series, Korra travels to Republic City and starts her airbending training with Tenzin. Tenzin himself is married to Pema He has two daughters, Jinora, a "bookworm", and Ikki, a "motor-mouth", while Meelo, his youngest child, is currently his only son. Pema is currently pregnant with the couple's fourth child.
However, Republic City is not what Korra imagined it to be. Anti-benders called “Equalists”, who oppose the arts of bending, utilize techniques such as chi blocking to further their goals of revolution, led by Amon. Korra must fight rampant crime and the anti-bender revolt, assisted by two brothers, Mako, a firebender, and Bolin, an earthbender. She is also joined by her animal guide, Naga, and the metalbending police force of Republic City, who are led by Toph’s daughter, Lin Beifong.