US nuclear stockpile is world's second largest

The United States is the only country to have used nuclear weapons, not once but twice.

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    The United States is the only country to have used nuclear weapons, not once, but twice.

    Al Jazeera is taking an in-depth look at the state of nuclear weapons and the push for non-proliferation this month.

    Al Jazeera's Shihab Rattansi reports from Washington, DC.


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