It's a non-proliferation treaty, so it just prevents building nukes.
(Though, now that I think about it, non-proliferation should only prevent new civs from building nukes, but the "nuclear club" could still build them... Stop the spread of nuclear tech.)
(Though, now that I think about it, non-proliferation should only prevent new civs from building nukes, but the "nuclear club" could still build them... Stop the spread of nuclear tech.)
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