<prompt> Translate the following text to EnglishWanasema kwamba mfano wa mkataba huo ni mkataba wa kuzuia kuenea kwa silaha za nyuklia ambao ulichukua miaka 20 kupata wanachama 178 na baada tu ya Marekani kutumia vikwazo kulazimisha serikali zisizojitolea.  <response>: But the analogy, they say, is the nuclear Non-Proliferation Treaty that took 20 years to obtain 178 members--and only after the United States used sanctions to force the hand of reluctant governments. 