Судя по английской вики, там чистых негров немного. Острова достаточно далеко от Африкии заселены не были.
The Cape Verde archipelago was uninhabited when the Portuguese discovered it in 1456. The modern population of Cape Verde descends from the mixture of European settlers and African slaves who were brought to the islands to work on Portuguese plantations. Most Cape Verdeans are therefore mestiços, to use the Portuguese term. Another term is creole, meaning those of mixed native-born African and native-born European descent.
yaplakal.com