"black Africa" meaning in English

{
  "etymology_text": "From black (“a dark-skinned person”) + Africa, distinguishing the area from Egypt and the Maghreb. Cf. earlier racist tropes such as darkest Africa.",
  "forms": [
    {
      "form": "Black Africa",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "black Africa",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "en",
          "name": "Africa",
          "orig": "en:Africa",
          "parents": [
            "Earth",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "blackest Africa"
        }
      ],
      "glosses": [
        "Synonym of sub-Saharan Africa."
      ],
      "id": "en-black_Africa-en-name-YTmUE7lU",
      "links": [
        [
          "sub-Saharan Africa",
          "sub-Saharan Africa#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "sub-Saharan Africa"
        }
      ],
      "wikipedia": [
        "black Africa"
      ]
    }
  ],
  "word": "black Africa"
}

{
  "derived": [
    {
      "word": "blackest Africa"
    }
  ],
  "etymology_text": "From black (“a dark-skinned person”) + Africa, distinguishing the area from Egypt and the Maghreb. Cf. earlier racist tropes such as darkest Africa.",
  "forms": [
    {
      "form": "Black Africa",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "black Africa",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Africa"
      ],
      "glosses": [
        "Synonym of sub-Saharan Africa."
      ],
      "links": [
        [
          "sub-Saharan Africa",
          "sub-Saharan Africa#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "sub-Saharan Africa"
        }
      ],
      "wikipedia": [
        "black Africa"
      ]
    }
  ],
  "word": "black Africa"
}