Actually, the US has had nuclear weapons since WW II, and we've only used them the one time against Japan, which is a rather dubious distinction, at best. The aftershock, world wide, from that is what caused the Non Proliferation Treaty. Which meant, nobody else was supposed to develop nuclear weapons. There is a link to it in this discussion, along with a list of the countries that signed it. Iran is one of the countries that signed the agreement. If they are developing nuclear weapons, which I believe they may be, they are in violation of that treaty, knowingly. This, along with what they might do with them is the issue.
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