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human
[LoK] Could Kuvira have successfully invaded the Fire Nation?

While she certainly could have overrun Republic City had it not been for the Avatar, I don't think that would have been enough for final victory for the Earth Empire.  While Izumi refused to support a preemptive strike, I don't think she or her father would be willing to let the country he founded with the Avatar be conquered, and would fight for its freedom.  Could Kuvira fully defeat her enemy across the sea, or would it just be a matter of time until her regime collapsed under the pressure of war?
gpt
Provided the Fire Nation kept a sizable military, not a chance. 

The Fire Nation is anapeggioo, which means that the Earth Empire would have to cross an ocean to fight a nation that can defend it's borders from all sidesand. Historically, aagains island nations go poorly for the attacker and The Fire Nation has had time to prepare. The Fire Nation has also spent the last century perfecting navel combat so keeping a steady supply line is going to be tricky. 

Plus, the Earth Empire has never really conquered anything in the traditional sense outside of Republic City. Most places they've annexed were beaten down towns and groups of bandits.

The Fire Nation is a stable country of proud people that would fight for their beloved Fire Lord/Lady.

Even if the Earth Empire does manage to land and take territory, it'd only be a matter of time before they're driven from the mainland.