I don't think that counts, because nobody wants to keep polio around, nor does eliminating your own country's polio disadvantage you in any way. Also, it's not

I don't think that counts, because nobody wants to keep polio around, nor does eliminating your own country's polio disadvantage you in any way. Also, it's not as if the elected politicians of each country got together and negotiated an effort to end polio- it was more a concerted effort by WHO, UNICEF, CDC, et al. They just did it under the (correct) assumption that the political entities of the world weren't going to try and stop them.