Serbo-Croatian is the most widely used language in the former component states of Yugoslavia, Bosnia and Herzegovina, Croatia, and the Republics of Serbia and Montenegro. It is a member of the South Slavic sub-group of Slavic languages along with Slovene, Macedonian, and Bulgarian. In cultural terms, Yugoslavia's eastern region (parts of Bosnia and Herzegovina and the republics of Serbia and Montenegro) is linguistically and religiously separated from the western region (parts of Bosnia and Herzegovina and Croatia). The result has been the evolution of two basic forms of the language, Serbian and Croatian, which are typically written in different scripts but based on the same New Stokavian dialect. In Yugoslavia there are over 10 million Serbian speakers; in Croatia there are nearly 6 million; and in Bosnia and Herzegovina there are over one million speakers. About 20 million people speak Serbo-Croatian around the world today.