Why are sweet potatoes called sweet potatoes?

Online Answer
When soft varieties were first grown commercially, there was a need to differentiate between the two. African slaves had already been calling the 'soft' sweet potatoes 'yams' because they resembled the yams in Africa. Thus, 'soft' sweet potatoes were referred to as 'yams' to distinguish them from the 'firm' varieties.
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But for years now, Ghana den Nigeria always dey fight over de top pot in terms of which country jollof better pass. After de judges taste both plates of jollof, all three judges vote in favour of de Ghana jollof. De final results be Ghana jollof 95% and Nigeria jollof which chef Turay prepare, score 75%.
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