How the Inkas governed, thrived and fell without alphabetic writing

4,000 kilometres, 11 million people, 80 different ethnic groups and no alphabet. Professor of History at the University of St Andrews in Scotland, Christopher Given-Wilson, examines the Inka civilisation. Expanding over "4,000 kilometres along the spine of the Andes, from Quito in modern Ecuador to Santiago in Chile," they displayed great achievements without the need of alphabetic writing.