How will continued proliferation of nuclear weapons change the global political order? This collection of essays comes to conclusions at odds with the conventional wisdom. Stephen Rosen and Barry Posen explore how nuclear proliferation may affect US incentives to confront regional aggression. Stephen Walt argues that regional allies will likely prove willing to stand with a strong and ready United States against nuclear-backed aggression. George Quester and Brad Roberts examine long-term strategic objectives in responding to nuclear attack by a regional aggressor. Richard Betts highlights...