Two decades of fighting between the Sudanese government and the Sudan People’s Liberation Army/Movement in southern Sudan ended with the Comprehensive Peace Agreement signed in 2005. The agreement allowed for a referendum, by which residents of southern Sudan voted for independence in July 2011, creating the country of South Sudan.
"Country Profile: South Sudan,"
Journal of Conventional Weapons Destruction: Vol. 16
, Article 31.
Available at: http://commons.lib.jmu.edu/cisr-journal/vol16/iss3/31