 Complete the following phrase:  Prilep was a major center of the Bulgarian national revival in Western Macedonia in the 19th century. One of the largest annual fairs in Macedonia was held in Prilep in the middle of the 19th century. European consulate exhibitions of 1887 estimate the population of Prilep to approximately 6.500 individuals, of which 4.000 were Bulgarians, 2.000 were Turks and the rest were Serbs with Greeks and Aromanians. In the late 19th and early 20th century, Prilep was part of the Manastir Vilayet of the Ottoman Empire. It was occupied by Bulgaria between 17 November 1915 and 25 September 1918 during World War I. In 1918 Prilep became part of the Kingdom of Serbs, Croats and Slovenes, and from 1929 to 1941 it was part of the Vardar Banovina of the Kingdom of Yugoslavia. On 8 April 1941, just two days after the start of the 