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human
[Avatar: The Last Airbender] So, is the impetus for the Hundred Year War the development of capitalism in the Fire Nation?

I mean, we have lots of evidence that the Fire Nation is indeed a burgeoning capitalist state. First off it’s the Fire *Nation* nations being the political organization of capitalist states (in contrast to the Earth *Kingdom* and Water Tribes), second the Fire Nation was clearly going through a period of rapid industrialization prior to and during the Hundred Year War (Fire Nation technology far outstrips that of other peoples’), third, the Fire Nation started the war specifically to expand its resources and established colonies around the world to do so (Avatar extra states the idea of “spreading prosperity” was bullshit and the Fire Nation was looking for land and resources and a larger labor pool). 

It seems like the actions of the Fire Nation are analogous to those of the European colonial empires more than anything else, the Fire Nation as the first state in Avatar to develop capitalism, while the Earth Kingdom is a large feudal state (heavily decentralized, seemingly based on, well, feuds) and the Water Tribes are split between a pre-class society and a society akin to the early civilizations to have sprung up on Earth.
gpt
Yes and no.

&#x200B;

Sozin specifically mentioned the idea of spreading the Fire Nation's prosperity to other nations and framed it under the narrative of unifying all four elemental countries under one flag-- the Fire Nation flag. He clearly thought that Roku, being a Fire Nation citizen himself, would be on board. 

After Roku said no, Sozin went ahead and established some colonies in the Earth Kingdom anyway-- maybe thinking that Roku would look the other way. But when Avatar Roku came and warned him to stop, he did so.

In this sense, the burgeoning industrialization and need for more resources and a larger workforce absolutely contributed to Sozin's plans for world domination. However, the Avatar kept him in check in much the same way that Avatar Kyoshi and, later, Avatar Korra would keep their respective Earth Kingdom dictators in check. 

So the impetus is at once the need for a larger workforce and more resources to support the increasing industrialization of the Fire Nation, but also (and not insignificantly) the death of Avatar Roku and subsequent disappearance of the Air Nomad Avatar (who would later be revealed to be Avatar Aang).