"perhaps resent the fact that Zuko called a halt to the invasion while they were winning?"
Hello, stabbed-in-the-back theory! You certainly won't lead to major political strife and possibly an even worse belligerent regime taking over!
And that's not counting the possibility of civil war against Zuko, the issues of thousands of unemployed soldiers, and parts of the Fire Nation seizing the opportunity to secede. (Some parts of it are bound to have a unique ethnic majority or a formerly independent past - why should it be any different to the UK, Spain, Japan, China etc - and any secessionist movement will LOVE the resulting chaos)
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Hello, stabbed-in-the-back theory! You certainly won't lead to major political strife and possibly an even worse belligerent regime taking over!
And that's not counting the possibility of civil war against Zuko, the issues of thousands of unemployed soldiers, and parts of the Fire Nation seizing the opportunity to secede. (Some parts of it are bound to have a unique ethnic majority or a formerly independent past - why should it be any different to the UK, Spain, Japan, China etc - and any secessionist movement will LOVE the resulting chaos)