maybe australia grew a military and has been takeing over the world durring the past 150 years after the war and they finally made there way to western america.(they started going west) wouldent australia be the only continent to have a chance to survive a nuclear fallout?
baldur's gate is a completely diferent genre, but is the closest you will get to the quality of fallout and you will feel right at home with the combat which is very similar to fallout (just think of it as real time fallout combat with some added tricks).