South
As the dominant language of pre-1991 Yugoslavia, it was used or understood by most ethnic groups of the federation. The Central Neo-Shtokavian dialect forms the basis for both Standard Serbian and Standard Croatian. Historically, Serbia's literary language was the Serbian recension of Church Slavonic (see Old Church Slavonic language ). In the 19th century a new literary language based on colloquial Serbian was successfully promulgated by Vuk Stefanović Karadžić . Croatian written in the {{link=Latin alphabet">Latin alphabet first appears in the mid-14th century. In the 19th century the Zagreb-based Illyrian political movement, which aimed at a union of all South Slavs, turned to the Central Neo-Shtokavian dialect as the basis for a literary language that would unite Croatians and bring them closer to their Slavic compatriots. The move toward a unified "Serbo-Croatian" was supported by the politically unified Yugoslav kingdom (1918–41) and communist Yugoslavia (1945–91). With the independence of Bosnia and Herzegovina in 1992, a Bosnian form of the language was recognized of necessity. Vocabulary and pronunciation differences exist among the three but form no real barrier to communication. The Croats and Bosnians use the Roman, or Latin, alphabet; the Serbs and Montenegrins of present-day Serbia and Montenegro use Cyrillic. Most Bosnians, Serbs, and Croats insist that their language is distinct from the others, and, perhaps, from a political perspective this is understandable; but most linguists consider Serbian, Croatian, and Bosnian a single language, which has historically been called Serbo-Croatian.