White Croats
It is considered that the Czech-Polish Croatian tribes were related to the Croatian tribes from Zakarpattia and Prykarpattia in Ukraine. They became separated during the migration period and seemingly formed one large Proto-Slavic tribe. It is theorized that the migration of those (White) Croatian tribes in the 7th century was the second and final Slavic migratory wave to the Balkans, which is related to the thesis by Bogo Grafenauer about the double migration of Slavs. According to this thesis, although it is possible that some Croatian tribes were present among Slavs in the first Slavic-Avar wave in the 6th century, it is argued that the Croatian migration in the second wave probably was not equally numerous to make a significant common-linguistical influence, while others considered they arrived in a significantly larger number. Zdenko Vinski and argued that the double migration thesis is supported by the rare findings of objects and ceramics of Prague-Korchak culture on the territory of Croatia, Bosnia and Herzegovina, and Serbia which were dated to the end of 6th and beginning of the 7th century (indicating first wave Slavs), and did not make a continuity with Slavic archaeological findings from the 8th-9th century, indicating assimilation. The Croatian tribes are also seen as a warrior group who assimilated into already present Slavs. In the territory of present-day Croatia they also gradually assimilated with the Pre-Slavic population because archaeology indicates a significant continuity of late antiquity population which have partially withdrawn to the mountains, coastal cities and islands.
Demographics of Montenegro
The vast majority (over 90%) of the population of Montenegro is of Slavic origin. Albanians make up 5 percent of the population (4.9% at the 2011 census), while there is also a small Romani minority (0.8% at the 2011 census). The Slavic population of Montenegro uses a large diversity in ethnic identities to describe their ethnicity. During the first decades after WW II most Slavic people identified themselves as Montenegrins, with less than 2% Serbs and less than 2% Croats in 1948. During the last decades of the existence of Yugoslavia up to 5% of the population declared themselves Yugoslavs (South-Slavs). During and after the Yugoslav Wars the ethnic identity of the Serbs (and in general the political influence of Serbia) became increasingly important in Montenegro and at the 2003 census almost one third of the population identified themselves as Serbs. The Serbs live mostly along the borders with Bosnia and Serbia, while the Montenegrins live in the center of the country. The Slavic population are in majority Eastern Orthodox Christians, but there is also a large Muslim minority, like in Bosnia and Herzegovina. Although most of the Slavic Muslims in Montenegro initially also identified themselves as Montenegrins, gradually over time more and more Slavic Muslims started to use the term Muslim as an ethnic designation, thus opting for a distinctive ethno-religious identity. After the Yugoslav Wars this changed again and at the 2003 and 2011 census most ethnic Muslims declared themselves Bosniaks, mainly because they had some historical relations with Bosniaks in Bosnia and Herzegovina and mostly live in the northeast of Montenegro.