I think this is also relevent here, just to add some interesting texture and hsitorical and political context to the U.S immigration records:
Source: Victor A. Friedman, "The Modern Macedonian Standard Language and Its Relation to Modern Macedonian Identity" in Victor Roudometof (ed.) Macedonian Question: Culture, Historiography, Politics, New York, 2000, p.189
Brown (1996) has discovered U.S Immigration Service records that attest to the fact that between 1900 and 1906 immigrants arriving from Macedonia, then still under Ottoman Turkey, called themselves Macedonians and their language Macedonian. It was only at the intervention of American "experts" that the classification of Macedonian was eliminated from the immigration documents, and self declared Macedonians were recorded as Bulgars, Serbs or Greeks.
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