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Avatar Aang had a greater connection to the previous Avatars than Korra, this is a result of their foundation, Aang grew up in a temple of the spirit with spiritual mentors and was more enlightened and reflective than Korra, but he was 12 when he saved the world, and Korra was older and did not succeed in many things as Aang, this speaks of a different pace and opportunities and demands of the surrounding world and circumstances

All elements are a convention, initially everyone was united, but after the Lions Turtles transferred the powers of the elements to people, they united according to the elements into tribes and then civil wars began