The Great War: the American Front by Harry Turtledove
It is 1914, and a generation lies rotting in the stinking trenches of modern warfare. A continent is crucified by a million miles of barbed wire. The cream of two powerful nationas are fighting each other to bloody stalemate. But this is not France . . . this is America.
The bloodiest of conflicts is played out in the heart of the new world, where north fights south to the death - again.
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