The ideas of unifying the south Slavic people date all the way back to before the World War, when the proposed concept of Yugoslavia was popular among many south Slavic people. The concept of Yugoslavia, as a single state for all South Slavic peoples, emerged in the late 17th century and gained prominence through the Illyrian Movement of the 19th century. The name was created by the combination of the Slavic words "jug" (south) and "slaveni" (Slavs). After the Slavic loss in the World War, the concept of a unified south Slavic state was shattered. The idea remained popular in the states of Serbia and Montenegro, who would eventually go to form the two states. The two states were always aligned, but in the 1920s the two states further approached each other, in hopes of creating a larger south Slavic alliance, potentially including Bulgaria; however they declined. In the 1940s, the concept of Yugoslavia grew in popularity, especially in the two greatly aligned states, and to a lesser extent in Bulgaria. The idea of Serbia-Montenegro-Bulgaria was proposed, though again, no progress was made. In 1950, Peter II of Serbia requested a fusion between the two nations in which both nations kept their monarchies. The Montenegrin monarch, Michael I, accepted the union, though both states kept their sovereignty. In 1962, the Union of Serbia and Montenegro was created.
Serbia and Montenegro both remained relatively autonomous communities; both still remained their monarchies under Peter II and Michael respectively. Shortly after the union was created, in 1965, the monarchy was forced to lose their power after the Serbian-Montenegrin Constitutional Revolution, creating a system in which the prime minister has power over the nation and the monarchy are simply symbolic figureheads. In 1977, the state invaded Vojvodina in hopes of unifying all of the Serbs, starting the Vojvodina crisis, which lasted for less than a year with a quick Serbian-Montegrin defeat by the USGA. This was humiliating for the Serbian-Montenegrin people, as this was their second defeat at the hands of the Austrians. Today Serbia-Montenegro is a prosperous democratic state much like the surrounding nations.