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On 25 May 1963, leaders of 32 newly-independent African nations came together for the first time in the Ethiopian capital Addis Ababa.

At stake was the dream of a united Africa.

In 2013, Alex Last spoke to Dr Bereket Habte Selassie who took part in that first gathering.

(Photo: Haile Selassie, centre, and Ghana's first President Kwame Nkrumah, left, during the formation of the Organisation of African Unity. Credit: STR/AFP via Getty Images)