prohibitionism
/ˌprəʊ(h)ɪˈbɪʃ(ə)nɪz(ə)m/ /ˌprəʊ(h)ɪˈbɪʃənɪz(ə)m/Chiefly US
noun
The principles or practice of prohibition; specifically support for or advocacy of the prohibition of alcohol.
Origin
Late 19th century; earliest use found in Decatur (Illinois) Daily Republican. From prohibition + -ism, after prohibitionist.