The African Union (AU) is a union consisting of 54 African states. The only African state that is not a member is Morocco. The AU was established on 26 May 2001 in Addis Ababa and launched on 9 July 2002 in South Africa to replace the Organisation of African Unity (OAU). The most important decisions of the AU are made by the Assembly of the African Union, a semi-annual meeting of the heads of state and government of its member states. The AU’s secretariat, the African Union Commission, is based in Addis Ababa, Ethiopia.