<P> Technological developments included coin minting, copper works, building craftsmanship, boat building, cotton textile . External trade was very active and important with Asia and Arabia . </P> <P> Great Zimbabwe is one of the more famous pre-colonial cities of Africa . Its Great Enclosure is considered the largest single prehistoric structure in Africa . </P> <P> See Also: </P> <Ul> <Li> List of African territories and states by date of colonization </Li> <Li> List of pre-colonial African cities </Li> </Ul>

What triggered the growth of cities in west africa