Nuclear proliferation
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World map with nuclear weapons development status represented by color.
██ Five "nuclear weapons states" from the NPT (Nuclear Non-Proliferation Treaty)
██ Other known nuclear powers
██ States suspected of being in the process of developing nuclear weapons and/or nuclear programs
██ States which at one point had nuclear weapons and/or nuclear weapons research programs
██ States capable of developing nuclear weapons within several years if the decision to do so were made
Nuclear proliferation is when a country starts making nuclear objects.