Northern Lightning Vs Southern Thunder!

(A/N: The main military faction I'm using is called the 'Union of American Continents'. You can find it my story book titled 'My Military Factions' to know more. The main character I'm using is a familiar OC of mine named John S. Grant. You can find him in my story book titled 'My Hero Characters' to learn more.)
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The United States of America... is dead.

Due to Special Order 191 being a huge success, the Confederacy is able to overrun the Union and win the Civil War. With help from Britain and France, the CSA now become an independent nation but soon are locked into a Cold War against the USA. As the decades went on and the CSA grew in power, both American countries have fought multiple wars against one another, each time the Confederacy kept on winning. It was only during WW2 did the CSA finally destroyed the USA and completely annexed the northern country into their territory, leading to the formation of the United Confederacy of America.

Soon, under a new and more dangerous regime, the UCA essentially betrayed their own allies in the form of 'liberating' them. Using tactics and strategies, along with superior firepower and technology, they're able to control most of the world in just over a decade. Russia and China become the last free nations in world as the surviving militaries and civilians make their last stand in what could only be described as an inevitable defeat.

However, just as all hope seemed lost, a prayer for a miracle is answered. In what could only be described as an act of God, UCA discovered a portal being opened in China and tried to invade the other side, only for their armies to be brutally pushed back. It was here the Confederacy is forced to fight against an enemy they thought they exterminated during the Civil War. An enemy that would spell doom for their nation and give hope to those enslaved by their nation.

That enemy... being the Union of American Continents.
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Pairing: John S. Grant x Harem