Esperanto
Zamenhof wanted to make an easy language to increase international understanding. He wanted Esperanto to be a universal second language. In other words, although he did not want Esperanto to replace national languages, he wanted a majority of people around the world to speak Esperanto. Many Esperantists initially shared this goal. General Assembly of UNESCO recognized Esperanto in 1954. Since then World Esperanto Association has got official relations with UNESCO. However, Esperanto was never chosen by the United Nations or other international organizations and it has not become a widely accepted second language.