What would happen if the terrorists were to attack us again

It's called "Doomsday for Islam"

Despite grandiose plans for such an attack on the United States, bin Laden has again failed to understand the nature of the American spirit and the likely vengeance such an attack would unleash from American military strategic nuclear forces. Since the United States entered the era of nuclear weapons technology many decades ago, it has always had detailed contingency plans on how the country would respond in a nuclear crisis.

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