I offer here a theory of “cultural convergence,” as a corollary to Darwin's natural selection, regarding how slave Creoles and culture were formed among the Gullah and, by extension, supported by other examples, in the Americas. When numerous speakers from different, and sometimes related, ethnic groups have words with similar sounds and evoke related meanings, this commonality powers the word into Creole use, especially if there is commonality with Southern English or the host language. This theory applies to cultural features as well, including music. Perhaps the most haunting example of my theory is that of “massa,” the alleged mispronunciation by Southern slaves of “master.” Massa is in fact the correct Bainouk and Cassanga ethnic group pronunciation of mansa, the famous word used so widely among the adjacent and dominant Mande peoples in northern and coastal west Africa to denote king or boss. In this new framework, the changes wrought by Mandinka, the Mande more broadly, and African culture generally on the South, are every bit as significant as the linguistic infusions of the Norman Conquest into what became English.