On an almost daily basis, American pundits and government officials warn of the consequences of a nuclear-armed Islamic Republic of Iran and outline what the United States must do about it. Some argue for preventive action to fend off apocalypse, as President George W. Bush famously warned of a “Middle East under the shadow of a nuclear holocaust.” Others temper this dystopia with reassurances that Iran, even with nuclear weapons, can be effectively contained and deterred from first strike. Neither of these scenarios captures the broader effects on US-Iran relations. In fact, Iran’s acquisition of a nuclear weapons capability would have a stabilizing effect on US-Iran relations. The two states would move toward rapprochement because the benefits of normalization as well as the costs of non-normalization will become greater and more overt to both sides.