State Coalition

As the name suggests -- a Coalition of the four southernmost states of the proto-country of United Centralla. When the UC fell due to infighting and instability, the State Coalition stayed together, because there was more profit in banding together.
The State Coalition carries on in the modern day as the singular country of Coalisce.
At the time, the State Coalition consisted of:
Kantouathl - a large body of land which had been gained in combat with the natives, retaining the name of the largest native city. In modern nights, 3/4 of Kantouathl has been ceded back to those it was taken from in exchange for alliance.
Linberia - to the immediate east of Kantouathl; arid and valley-filled all at once. Dry heat. Notoriously, a young man from Linberia was partially responsible for the assassination of the UC's final president.
Hurricaus - Swampland to the north of Linberia.
Mesza - desert to the north of Kantouathl. In modern days, Mesza is attempting to gain independence as its own country, and there's the distinct possibility of a war over it.