system
Given the following post, respond as if you're commenting on Reddit:
human
[ATLA] Did Aang do anything to end the corruption in the Earth Kingdom after the Hundred Year War?
gpt
The issue actually is that Aang and the Earth King did.  To deal with the issues created by Long Feng and the Dai Li, the Earth King dramatically centralized power with Ba Sing Se around the throne; to deal with the issues revealed by the War, he centralized power throughout the Earth Kingdom around Ba Sing Se.  This would prevent a repeat of the War, where a divided Earth Kingdom fell bit by bit to the Fire Nation with no organized opposition, but laid the groundwork for the issues of Korra's time.

By putting so much authority back into the hands of the monarch, the Earth King ensured that, as soon as he died and his spoiled daughter took the throne, the Earth Kingdom would again fall victim to a corrupt autocrat.  By centralizing so much authority and building the necessary communication and transportation network to enforce it, he gave her the tools needed to subjugate the Earth Kingdom to her petty demands.  

So much authority rested in the hands of the Earth Queen that, when she was murdered by Zaheer, there was no organized bureaucracy prepared to take over and ensure a smooth transition of power, nor even anyone in place to run things during the interregnum.  Instead the Earth Kingdom collapsed into chaos within a matter of months, as virtually every facet of its government was routed through the Palace.