what is the only country that is not a member of the african union
African Union The African Union (AU) is a continental union consisting of all 55 countries on the African continent, extending slightly into Asia via the Sinai Peninsula in Egypt. It was established on 26 May 2001 in Addis Ababa, Ethiopia, and launched on 9 July 2002 in South Africa,[6] with the aim of replacing the Organisation of African Unity (OAU) established on 25 May 1963 in Addis Ababa, with 32 signatory governments. 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.
Union of South Africa The Union of South Africa was a self-governing autonomous dominion of the British Empire. Its independence from the UK was confirmed in the Balfour Declaration 1926 and the Statute of Westminster 1931. It was governed under a form of constitutional monarchy, with the Crown represented by a governor-general. The Union came to an end with the enactment of a new constitution on 31 May 1961, by which it became a republic and temporarily left the Commonwealth, under the new name Republic of South Africa.