 This declaration ended the Addis Ababa Agreement and removed autonomy from Southern Sudan, sparking the Second Sudanese Civil War from 1983 to 2005.After the signing of the Comprehensive Peace Agreement (also known as the Naivasha Agreement) between the government of Sudan and the rebel Sudan People's Liberation Army, Southern Sudan regained its status as an autonomous region of the Republic of Sudan from 2005 to 2011, when South Sudan gained independence.On 9 January 2005, the Government of Southern Sudan was established after the signing of the Comprehensive Peace Agreement.