The Anthem of the Kingdom of Yugoslavia was created in December 1918 from the national anthems of the Kingdom's three historical constituent lands: Kingdom of Croatia-Slavonia (Croatia), Kingdom of Serbia (Serbia) and Duchy of Carniola (Slovenia).
At the time, the Yugoslav authorities considered the three dominant South Slavic ethnic groups â Croats, Serbs, and Slovenes â as three interchangeable names for one ethnic group (Serbo-Croatian and "nation" or "people"), while the Pan-Slavic politicians and parts of academia viewed them as three subgroups of one South Slavic nation (, ; "Yugoslavs"). Accordingly, the official language was thus called Serbo-Croato-Slovene.
Although a law on the national anthem did not exist, the anthems of all three South Slavic nations were unified into a single anthem of the Kingdom. It started with the first part of the Serbian anthem "Boà ¾e pravde", continued with the first verse of the Croatian anthem "Lijepa naà ¡a domovino", which were in turn followed by first verse the de facto Slovenian anthem "Naprej zastava slave". The anthem finished with the refrain of the first verse of the Serbian anthem again.
It was officially used between 1919 and 1941; there was no official document that declared it invalid or void. The Constitution of the Kingdom of Yugoslavia was not in effect after the April capitulation.