Wakanda is the latest in a series of utopian mythical places. Perhaps the best known in the US is Diddy-wa-diddy. To quote a researcher:
'This is the largest and best known of the Negro mythical places. Its geography is that it is “way off somewhere.” It is reached by a road that curves so much that a mule pulling a wagon-load of fodder can eat off the back of the wagon as he goes. It is a place of no work and no worry for man and beast. A very restful place where even the curbstones are good sitting- chairs.'
Right next to the Big Rock Candy Mountain but just short of Fiddlers Green.