Civilization 4 has nuclear weapons. When you want to have fun, click the red button. You cannot bomb the opponent's buildings. We have already started a war! What's going on! Urgent request!

When selecting an attack position in Civilization 4, the damage range cannot include your own territory or friendly units. So you won't be able to use nuclear weapons to destroy enemy units coming to attack the city in Civilization 4. Even trying to use nuclear weapons to attack a city invaded by one's own spies turns out to be impossible

In addition, after the United Nations is built, a UN proposal can be voted on to build a nuclear non-proliferation treaty, thus prohibiting the production and use of nuclear weapons ( However, existing nuclear weapons will not be destroyed). If the resolution is passed before the Manhattan Project is completed, you won't even be able to complete the Manhattan Project.