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After the conclusion of the Hundred Year War, Aang and Zuko brought people from the four nations together and founded the United Republic of Nations, with its capital being Republic City, a large "metropolis powered by steampunk-type technology" such as cars and motorcycles.[9] Aang and Katara had three children, the youngest of which was Tenzin, the only airbender of the three siblings. Meanwhile, Toph Beifong traveled extensively to teach metalbending. After Aang's death, the next Avatar, Korra, was born in the Southern Water Tribe.