Originally Posted by SciFiReader
You might to try this web-site which deals with Allo-history novels, which has a good listing of many books by author's who have created current day dystopias by altering key events from the past. Particularluy changing the outcomes of things like the Civil War, WWII, etc.
One of my favourites in this category is 'Climb the Wind'
(for somewhat biased reasons
is also very good (and quite appropriately dystopian as well!).