After World War II in the Josip Broz Tito era, nationalism was appealed to for uniting South Slav peoples. Later in the 20th century, after the break-up of the Soviet Union, leaders appealed to ancient ethnic feuds or tensions that ignited conflict between the Serbs, Croats and Slovenes, as well as Bosniaks, Montenegrins and Macedonians, eventually breaking up the long collaboration of peoples. Ethnic cleansing was carried out in the Balkans, resulting in the destruction of the formerly socialist republic and producing the civil wars in Bosnia and Herzegovina in 1992–95, resulting in mass population displacements and segregation that radically altered what was once a highly diverse and intermixed ethnic makeup of the region. These conflicts were largely about creating a new political framework of states, each of which would be ethnically and politically homogeneous. Serbs, Croats and Bosniaks insisted they were ethnically distinct although many communities had a long history of intermarriage. Presently Slovenia (89% Slovene), Croatia (90.4% Croat) and Serbia (83% Serb) could be classified as nation states per se, whereas North Macedonia (66% Macedonian), Montenegro (42% Montenegrin) and Bosnia and Herzegovina (50.1% Bosniak) are multinational states.