Empire of Kutath
The nation started as a city-state named Auror. When the fourth global war went nuclear the Aurians, who at the time were very far behind on technology, entered the war against the imposing super-power Allies. The war lasted 20 more years, Auror itself was occupied for 12 of those years. During the occupation the city had defenses installed and high-tech elements were put in place. When the IV Aurian Army marched through the south gates almost unopposed the city, and the great wealth of technology where taken in by them. When the war was over most other cities were scarred by at least one nuclear or chemical attack. Auror became the largest city and was the most technologically superior nation. Using this the Aurians annexed other nations as they fell into depressions. Soon the whole world rallied under the Aurian Flag and the Great Khan of Auror declared that the world is now united and will become the Unholy Empire of Kutath.