BRIDGETOWN, Barbados - LAST MONTH Africa’s 54 leaders celebrated the 50th anniversary of the founding of the Organization of African Unity (OAU) – it became the African Union (AU) in 2002 – which had its origins in the struggle for decolonization and against apartheid. It was founded in 1963 in Addis Ababa, Ethiopia, the venue chosen to mark the anniversary. Since it was founded, the AU has sought to push for peace and prosperity and to unite Africa. But opinion is divided on the success.