"Great Migration" meaning in English

{
  "forms": [
    {
      "form": "the Great Migration",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1",
        "head": "Great Migration"
      },
      "expansion": "the Great Migration",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "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"
        }
      ],
      "examples": [
        {
          "ref": "2015, Sabina G. Arora, The Great Migration and the Harlem Renaissance, Encyclopaedia Britannica, →ISBN, page 10:",
          "text": "The pull factors in the Great Migration included encouraging reports of good living conditions and jobs with good wages in the North and West.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The movement of six million African Americans out of the rural Southern United States to the urban Northeast, Midwest and West that occurred in the 20th century."
      ],
      "id": "en-Great_Migration-en-name-8ZVY4y4~",
      "links": [
        [
          "African American",
          "African American"
        ],
        [
          "Southern United States",
          "Southern United States"
        ]
      ],
      "raw_glosses": [
        "(US, historical) The movement of six million African Americans out of the rural Southern United States to the urban Northeast, Midwest and West that occurred in the 20th century."
      ],
      "tags": [
        "US",
        "historical"
      ]
    }
  ],
  "word": "Great Migration"
}

{
  "forms": [
    {
      "form": "the Great Migration",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "def": "1",
        "head": "Great Migration"
      },
      "expansion": "the Great Migration",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "American English",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English terms with historical senses",
        "English terms with quotations",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2015, Sabina G. Arora, The Great Migration and the Harlem Renaissance, Encyclopaedia Britannica, →ISBN, page 10:",
          "text": "The pull factors in the Great Migration included encouraging reports of good living conditions and jobs with good wages in the North and West.",
          "type": "quote"
        }
      ],
      "glosses": [
        "The movement of six million African Americans out of the rural Southern United States to the urban Northeast, Midwest and West that occurred in the 20th century."
      ],
      "links": [
        [
          "African American",
          "African American"
        ],
        [
          "Southern United States",
          "Southern United States"
        ]
      ],
      "raw_glosses": [
        "(US, historical) The movement of six million African Americans out of the rural Southern United States to the urban Northeast, Midwest and West that occurred in the 20th century."
      ],
      "tags": [
        "US",
        "historical"
      ]
    }
  ],
  "word": "Great Migration"
}