Countries with Nuclear Weapons Capability
Acknowledged: Britain, China, France, India, Pakistan, Russia, United States
Unacknowledged: Israel Seeking: North Korea,1 Iran2
Abandoned: South AfricaConstructed but then voluntarily dismantled six uranium bombs. Belarus, Kazakhstan, UkraineWhen Soviet Union broke up, these former states possessed nuclear warheads that they have since given up.
You can put Canada in the"abandoned" column. In the 1950s we had American-produced nukes on the Bomarc surface-to-air missiles but they were returned to the USA. We do have the capability to produce a nuke in fairly short order but all of our technology is currently used for civilian production of electricity and medical radioisotopes (that's the official story, anyway).
Topic drift- IIRC Canada is the world's no. 1 producer of radioisotopes.