>>91170981outside of the fire nations little tanks, the never explained drill, and all the little tinkerings of the mechanist, everything from the architecture to the actual tech used in the last airbender is ancient east asians.
We are shown only ONCE a crossbow, which means it is at least in the 6th century China, and the fire nation has roman ballistics, but other than that we see people even in the upper ring of Ba Sing Se living in what is far pre-enlightenment era societies.
They there isn't even formal education outside of bending for the most part unless you count indoctrinating by the fire nation.