[quote=@Terminal]
There's some rather considerable distance between your two nations, which eliminates expansion as an easy excuse for war. One side (or both) would probably have had to been very, very angry with the other in order to mount enough effort to send large armies that far.

Otherwise, a mere cold war and political interference would probably have been the more sensible eventuality.
[/quote]

A fair point, though distance did little to discourage Spanish conquistadores from sacking civilizations across the world in search of wealth. Britain (well, to be honest mostly the EITC under the name of their home country) conquered and ruled India just for its wealth. If Churro's guys opportunistically attacked and looted that currently ruined city, it could havd been for similar reasons. If so they would have gotten plenty of that gold, though probably to bad effect once there was a retaliation.

[@Sini] 

I would imagine they have lived in the general vicinity for a long time, as I doubt their four huge cities are very new and in any case it's been long enough for them to evolve into something of a sub-race of human. Maybe if we went back far enough to when some were still semi-nomadic animal shepherds, ther could have been one or two bands that strayed farther north and encountered te ancient precursors of the Commonwealth. 

[@OneEyedChurro] 

Terus similarly has not existed as such for a terribly long time. About 200 years ago they vassalized the last regions and unifed Azraca. The further you go back from there, the more divided the region was.