Harry Turtledove's American Empire: The Victorious Opposition is the last book in this series...and I desperately need to finish this series.
Since I read over 1,000 words a minute, books tend to be a two or three hour feast at the most. But Turtledove's books are so packed with characters, details, and plot changes, that it takes me a long time to read his books. And they are wonderful!
The Guns of the South asks the question, "Would the Civil War have been different if the South had been supplied with semi-automatic rifles/grenades/other futuristics weapons?" The answer is "You betcher Aunt Tilly, it would have." The surprise is that South African neo-Nazis have come from the future to make sure that the South wins, and that blacks are kept in a subservient position. Of course Robert E. Lee wins the war, but also when he finds out the real reason the soldiers are helping, he refuses anymore help and destroys them.
In How Few Remain, he returns to basic revisionist history, telling how the South wins the Civil War, and then wins a second Civil War over Mexican Territory.
The next set is The Great War: American Front, The Great War: Walk in Hell, and The Great War: Breakthrough which parallels the first World War, and how the two countries in America and their allies would have fought. Socialism is born, and Reds revolt in the South.
American Empire:Blood and Iron, American Empire: The Center Cannot Hold, and this last book I NEED DESPERATELY chronicle the South's anger and plans to regain their autonomy, and the rise of a radical political party in the South that mirrors Hitler's regime.
http://www.sfsite.com/~silverag/turtledove.html tells you more. If you love American History, these are a must read for you!!!!!