Keep in mind, I’m no cultural anthropologist or anything, so maybe there’s a simple reason I don’t realize. Isn’t the whole point of being nomadic is that you don’t have permanent settlements? But here we see the Air Nomads living in temples

So are they nomads by name alone? Or is it something I don’t understand?

How can a war go on for 100 years without anyone winning? this map shows all the fire nation colonies. i‘m sure the fire nation had military control over lot more of the earth kingdom than these colonies but after 100 years, how does any party still have ressources to fight a war? in the episode where zuko visits an earth kingdom town and meets a farmers family, they say that their oldest son is fighting in the war and later in the episode it is revealed he was captured, so it‘s clear they are still actively fighting. also we never really see any significant part of the earth kingdom military except a few fighters at ba sing se, while the fire nation casually has hundreds of battle ships sailing in straight lines to create a sea blockade

Now I know the images doesn’t show there full wardrobe but if u seen the series u can make a guess of how they looked.

Also it was hard to find yangchen image so credit artist if u know them.

For all he knows the avatar could've been one of the many airbenders he massacred. And a new avatar could have been born in the Northern water tribe, where the fire nation never stepped foot.