Supilo's opinion (which was then shared by a large portion of Croatian and Serbian intelligence) had been that Croats and Serbs (to which he later added Slovenes as well) are one three - tribal people - therefore, not three tribes, even less three nations, but one Yugoslavian nation with three names.
Supilovo mišljenje (koje je dijelio i nemali dio ondašnje hrvatske, pa i srpske inteligencije) bijaše da su Hrvati i Srbi (kojima su kasnije pridruženi i Slovenci) jedan troplemeni narod - dakle, ne tri naroda, a kamoli tri nacije, nego jedan jugoslavenski narod s tri imena.