This question was popular and some candidates who attempted it answered it brilliantly. Such candidates were able to bring out the factors and explained them properly. The factors stated and explained were not limited to, but included, the following:

(i) Able and strong leadership;
(ii) different sources of revenue;
(iii) trade connections with the Europeans along the Coast;
(iv) the skills of the craftsmen in the production of bronze human heads and other figures.