I read somewhere that one way of doing it is to make the manhattan project team-only, and so I changed the stats in the projectinfo xml file. However this does not seem to have worked, as all the civs could use nukes regardless of this change. Does anyone know of a hack to remove nukes or limit them to a single nation (that does the manhattan project)? The problem I have with nukes is the AI keeps overusing it, and in the modern era each turn takes forever due to the endless nuke animation. It's really frustrating and makes the game rather boring.