Unification Day on 6 September is a national holiday of Bulgaria. It commemorates the unification of Eastern Rumelia and the Principality of Bulgaria in 1885.
United Bulgaria, a lithograph by Nikolai Pavlovich (1835–1894)
Bulgarian irredentism is a term to identify the territory associated with a historical national state and a modern Bulgarian irredentist nationalist movement in the 19th and 20th centuries, which woul
Bulgarian Exarchate (1870–1913).
Treaty of San Stefano (1878) showing the boundaries of Bulgaria.