@angelofoctober That's really good! the nationality is just what nation they hail from. I figured this was a good way for nonbenders to establish their origin, and also this way you can tell us if your character was born in Republic City as well
Well our story begins in the Si-Wong desert and the plot is very travel based, but I imagine the world looking more like a modern world, since the technology we're using is a cleaner version of what they had in the 70s-80s, though it might be underdeveloped in some areas, such as the desert and the Southern and Northern water tribe (and the swamp lands).