What is "yugoslavism"

Yugoslavism refers to the nationalism or patriotism associated with South Slavs and Yugoslavia. Yugoslavism has historically advocated the union of all South Slav populated territories now composing Bosnia and Herzegovina, Bulgaria, Croatia, Montenegro, Serbia (and the disputed region of Kosovo), Slovenia, and Macedonia. It became a potent political force during World War I with the assassination of Austrian Archduke Franz Ferdinand by the Yugoslavist militant Gavrilo Princip and the subsequent invasion of Serbia by Austria-Hungary. During the war the Yugoslav Committee composed of South Slav emigres from Austria-Hungary (including twelve Croats, three Serbs, and one Slovene), supported Serbia and vouched for the creation of a Yugoslav state. However the assassination of Franz Ferdinand triggered resentment amongst those Austro-Hungarian Croats and Slovenes who had favoured being within Austria-Hungary.