The Constitution of Southern Sudan was the 2005 Interim Constitution of Southern Sudan, as established by the Government of Sudan and the Sudan People's Liberation Army/Movement within the framework of the Comprehensive Peace Agreement ending the Second Sudanese Civil War, signed into practice on 9 January 2005. The constitution establishes a presidential system of government headed by a President who is both Head of State, Head of Government, and the Commander-in-Chief of the armed forces. The constitution establishes English and Arabic as the official languages.