Robert College, a branch of the State University of New York, also played an important part in educating the new Bulgarian elite. It opened its campus in Istanbul in 1863, teaching mathematics, natural history, economics, logic, political history, international law, philosophy, and the English language. By 1868 half the student body were Bulgarians. Two future Prime Ministers of Bulgaria, Konstantin Stoilov, Todor Ivanchov studied there. American missionaries also founded the newspaper "Zornitsa", which published for seventy-six years, with articles on science, history, and the theory and practice of western democracy. The model of the American Republic was frequently discussed by Bulgarian intelligentsia as one model for an independent Bulgaria.