Earthbender rebellions

The Earth Kingdom Rebellions was an armed uprising against the Fire Nation, formed during the later stages of The War at an unknown time after the Coup of Ba Sing Se in 100 ASC. Its success surprised and alarmed the Fire Nation. It was admitted by a Fire Nation General that the powerful Fire Nation armies in the Earth Kingdom were insufficient to put down the threat, and that Fire Nation domestic forces were required for reinforcement.

The uprisings and its successes were mentioned to Fire Lord Ozai in a war meeting a day before the eclipse. Acting upon this information, Ozai decided to use the power of Sozin's Comet to burn down the Earth Kingdom, ending the rebellion once and for all. . The plan proved to be a failure, with Ozai's defeat in the Battle at Wulong Forest.

Now that the war is over, it can be assumed these rebellions have ceased.