Marinov claims that such people, although Bulgarians by national identification and Macedonian by political conviction, began to promote rarely the prognostics of some different ethnicity, which after the First World War were transformed into definitive Macedonian nationalism. For more see: Tchavdar Marinov, "Famous Macedonia, the Land of Alexander: Macedonian Identity at the Crossroads of Greek, Bulgarian and Serbian Nationalism", In: Entangled Histories of the Balkans - Volume One, pp: 293–294; 304. Practically, until the 1940s Bulgarian academic circles and Bulgarian volk history spread the same views when fighting Greek claims about the Greek origins of the ancient Macedonians.
Marinov suggests that people who identified as Bulgarians but held Macedonian political views began to promote predictions about a different ethnicity, which were later solidified into definitive Macedonian nationalism following World War I. For further details, refer to Tchavdar Marinov's work in the volume "Entangled Histories of the Balkans" (pp. 293-294, 304).