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[ATLA] why did the Fire nation not revolt once Zuko became Firelord?

Why did the Fire nation(citizens and generals) not revolt once Zuko became firelord? And why did the colonies not revolt and try to establish a independent state when Zuko decided to withdraw from the colonies?
gpt
There were assassination attempts and an attempted coup.  There wasn't a large scale revolt in the colonies mainly because Zuko actually listened to the colonists and withdrew his support for the Harmony Restoration Movement and then gave his support to the formation of the United Republic.  That action itself garnered a lot of goodwill, both at home and internationally, demonstrating that this new Fire Lord would listen to the needs and concerns of the people and support them.

On the mainland, Zuko actually enjoyed some benefit from his predecessors' propaganda apparatus.  For a hundred years loyalty to the Fire Lord had been equated to loyalty to the Fire Nation and both had been taught as a universal good.  While Zuko eventually dismantled that apparatus, those attitudes didn't disappear overnight.  Enough people were convinced of his legitimacy as Fire Lord, and convinced that legitimacy was enough to justify his reign, that it wasn't feasible to mobilize a large scale resistance to his ascension.  

As it happened, ending the War and withdrawing troops from the Earth Kingdom *didn't* result in the destruction or impoverishment of the Fire Nation.  As time went on, opposition to Zuko's reign fell off and he became extremely popular.  Zuko's reformed public education and independent press brought to light the atrocities committed by previous Fire Lords and, though the War became a source of national shame, the story of the exiled prince who ended it became a beloved folk-tale.

Also, he started riding around on a motherfucking dragon.  Everyone agreed that was awesome and they didn't want to piss that guy off.