#yes a 20 kilos rock could pull bigger damage than a cabbage-sized fireball

[tonhalszendvics]

Someone please explain Avatar worldbuilding.

Fire Nation has machinery.

This allowed them to conquer half of the world, and wipe out most of the Southern Water Tribe – they had no comet power there, and we saw how is firebending at the poles.

The Mechanic is from the Earth Kingdom. His impact on the weapons is unquestionable. His knowledge has to come from somewhere, except a, he was self-taught, b, he received education after his capture. (I'm kind of sure it was actually a mix of the two.)

Ba Sing Se has trains. Actual, working train lines. Either they stole the technology or they came up with themselves, but they have to maintain it, which means they know shit about engines.

Conclusion: WHERE were the Earth Kingdom mechanized units??

Edit: I have the answer, thanks