The Legend of Korra focuses on a new Avatar called Korra, with many changes in the execution of the story. Korra
is not only older than Aang, but also the complete opposite of him. She
is more furious, prideful and fearless, at least in the beginning. Not
only the main character has matured, but the story itself is now more
complex and darker, much to my liking :)
After the fall of the fire Nation all Kingdoms became one big Nation. Without a fearful enemy the people began to life in property and harmony, but over the years a gap developed between benders and non-benders, who had it harder to get jobs. Non-Benders are challenged by being normal and have a harsher and harder life to live. They felt left behind and wanted equality for humanity. Thats the conflict that give rise to a terrist group and their leader Amon, who has the ability to banish bender powers. Korra must face a gruesome enemy, who could take away her bending, which defines who she is.