 Complete the following phrase:  Independent sources in Europe between 1878 and 1918 generally tended to view the Slavic population of Macedonia in two ways: as Bulgarians and as Macedonian Slavs. German scholar Gustav Weigand was one of the most prominent representatives of the first trend with the books Ethnography of Macedonia 1924, written 1919 and partially with The Aromanians 1905. The author described all ethnic groups living in Macedonia, showed empirically the close connection between the western Bulgarian dialects and the Macedonian dialects and defined the latter as Bulgarian. The International Commission constituted by the Carnegie Endowment for International Peace in 1913 to inquire into causes and conduct of the 