The US has never liked admitting others into the nuclear club. Not Britain, not France, not Israel. Britain and France were big-name allies whom the American public would never in a million years agree to attack. The USSR and China were too big to bully. Israel, India and Pakistan took the world by surprise with their revelations (or hints of, in Israel's case). North Korea and Iran, in normal circumstances, would be small enough for the US to push around if they didn't have nukes, so steps are taken to ensure they don't.
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