“If Osama bin Laden’s al-Qaeda — or the dictators of North Korea or Iran — had the ability to destroy America as a superpower, would they be tempted to try?

Wouldn’t that temptation be even greater if that result could be achieved with a single attack, involving just one nuclear weapon, perhaps even one of modest power and relatively unsophisticated design?

And, what if the attacker could be reasonably sure that the United States would not know who was responsible for such a devastating blow?

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