I recently reread a series by Harry Turtledove....all based on the premise of the Confederacy winning the war....it starts in How Few Remain....in the Civil War....then in a second war that takes place twenty years later.....the next set in this series involve the great war....the trenches are all along the usa/csa border....and then the next set takes place between world wars, and shows the rise of fascism, then comes world war two....a great series for anyone who likes history...and alternative history.