"slave state" meaning in English

{
  "antonyms": [
    {
      "word": "free state"
    }
  ],
  "forms": [
    {
      "form": "slave states",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "slave state (plural slave states)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "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": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "American Civil War",
          "orig": "en:American Civil War",
          "parents": [
            "Historical events",
            "History of the United States",
            "Slavery",
            "War",
            "History",
            "United States",
            "Society",
            "Work",
            "Conflict",
            "Military",
            "Violence",
            "All topics",
            "North America",
            "Human activity",
            "Human behaviour",
            "Fundamental",
            "America",
            "Human",
            "Earth",
            "Nature"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Slavery",
          "orig": "en:Slavery",
          "parents": [
            "Society",
            "Work",
            "All topics",
            "Human activity",
            "Fundamental",
            "Human behaviour",
            "Human"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Prior to the American Civil War, any of the states in which the owning of slaves was legal."
      ],
      "id": "en-slave_state-en-noun-n~4XmiSv",
      "links": [
        [
          "state",
          "state"
        ],
        [
          "slave",
          "slave"
        ],
        [
          "legal",
          "legal"
        ]
      ],
      "raw_glosses": [
        "(US, historical) Prior to the American Civil War, any of the states in which the owning of slaves was legal."
      ],
      "tags": [
        "US",
        "historical"
      ]
    }
  ],
  "word": "slave state"
}

{
  "antonyms": [
    {
      "word": "free state"
    }
  ],
  "forms": [
    {
      "form": "slave states",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "slave state (plural slave states)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "English terms with non-redundant non-automated sortkeys",
        "en:American Civil War",
        "en:Slavery"
      ],
      "glosses": [
        "Prior to the American Civil War, any of the states in which the owning of slaves was legal."
      ],
      "links": [
        [
          "state",
          "state"
        ],
        [
          "slave",
          "slave"
        ],
        [
          "legal",
          "legal"
        ]
      ],
      "raw_glosses": [
        "(US, historical) Prior to the American Civil War, any of the states in which the owning of slaves was legal."
      ],
      "tags": [
        "US",
        "historical"
      ]
    }
  ],
  "word": "slave state"
}