The region has been negatively affected by two civil wars since Sudanese independence: from 1955 to 1972, the Sudanese government fought the Anyanya rebel army (Anya-Nya is a term in the Madi language which means "snake venom") during the First Sudanese Civil War, followed by the Sudan People's Liberation Army/Movement (SPLA/M) in the Second Sudanese Civil War for over 20 years. As a result, the country suffered serious neglect, a lack of infrastructural development, and major destruction and displacement. More than 2.5 million people have been killed, and millions more have become refugees both within and outside the country.