Several nations are challenging decades of effort by the international community to prevent the spread of nuclear weapons. Robert D. Blackwill and Albert Carnesale, along with eight other experts, analyze the national security consequences for the United States if new nuclear-weapon states emerge to threaten American interests. The contributors examine the nations most likely to cross the nuclear threshold and how these countries would acquire, maintain, and protect their new nuclear weapons capabilities. Individual chapters address: how nuclear weapons in Saddam Husseins hands could have...