Can is a difficult word. If by “can” you mean has the physical capability, most countries have that. If they had the desire and the all-clear from the rest of the world, they absolutely could do it. If by can you mean “would be allowed to”, then the reason they can’t is that the international community and the current nuclear powers don’t want it to happen.
All of that is, of course, is a moot point because not many countries truly want nuclear weapons. It only makes them less safe. Once you let that nuclear genie out of the bottle, you paint a target on yourself. If you get into a war with another nuclear power, you risk far greater destruction than a conventional war could cause.
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