Creation of a BackStory

[The Corrosian Alliance]

I've been trying to write a good back story to my nation, but i haven't been having any luck, so i was wondering if anyone could write a good, detailed, back story for my nation. I would appreciate this very much.

Details are below and if I come up with anymore information I'll post it.

The Corrosian Alliance Factbook

-Must be about the "Great War" that created my nation
-Well Detailed
-Well Rounded
-Revolve around something along the lines of back-rooming dealings and alliances like those that lead to WW1
-War that encompessed all of the Continent and nations on it
-Very Brutal and bloody war that lasts 21 years and ends in 1906
-Corrosia is essentials the "good guys" and ends war with a treaty
-Corrosia and Mentia were allies
-Delinka and Cloacka were allies but betrayed each other late in the war
-Nephina was instagater of the war and launched brutal assaults first on Cloacka
-Cloacka is over-run and surrenders to Nephina after 7 years
-Nephina is last to fall
-WW1 Tech
-Main military soldiers look like this, but with variations between each nation's soldier(This is the Corrosian Soldier color, and each nation's color is represented by their color on the map)