Vieux Royaume
A year later, in 1912, Nistor moved to Czernowitz, to hold the chair of Southeastern European history, but after the start of World War I, he moved to the Romanian Old Kingdom, where he published various studies on the history of Bukovina. He was elected a member of the Romanian Academy in 1915. He also authored an ethnographic map of Bukovina under Austrian domination ("see Cisleithania"), based on the census of 1910.