this phenomenon is caused primarily for economic reasons. See also List of Macedonian Bulgarians Bulgarians in North Macedonia Bulgarians in Albania Slavic-speakers of Greek Macedonia Internal Macedonian Revolutionary Organization Macedonia (terminology) Macedonian nationalism References Ethnic groups in Macedonia (region) History of Macedonia (region) 20th century in Bulgaria Bulgaria–North Macedonia relations 01 People from Blagoevgrad Province Ethnic groups in Greece Demographics of the Ottoman Empire Slavic ethnic groups Macedonian people of Bulgarian descent South Slavs Bulgarians from the Ottoman Empire