The Great War: Walk in Hell

Alternate History is historical fiction that examines the ramifications of a change or changes in known history. Alternate History can use science-fiction devices -- such as time-travel -- to change history, or it can simply pick a point where, had things merely happened differently (for example: Abraham Lincoln decided not to go to the theater that night, or Henry VIII stayed married to his first wife), history might have taken another path altogether.
-- Alternate History without Science Fiction
-- Turtledove re-creates a World War I where the Confederate States of America and the United States of America are on opposite sides, and the battles take place on American soil.