South Slavs
The Kosovo Myth was used by Serbian nationalists before WWI as an ideological tool in order to argue for a Serbian-led Yugoslavia instead of Yugoslavia as state of all South Slavs equally. After the great losses during World War I which the Serbian army suffered, these ideas further led to confusion among Serbian nationalists between support for a Serbian-led Yugoslavia and Yugoslavia as a state of all South Slavs. In this context, this was the period in which Serbian nationalists began to advance ideas about Serbian ethnic superiority over other South Slavs."