"Volunteer State" meaning in English

{
  "etymology_text": "Perhaps because of the prominent role of volunteer soldiers from Tennessee during the War of 1812; perhaps in reference to volunteers for the Mexican–American War.",
  "head_templates": [
    {
      "args": {
        "head": "Volunteer State"
      },
      "expansion": "Volunteer State",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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        {
          "kind": "place",
          "langcode": "en",
          "name": "State nicknames of the United States",
          "orig": "en:State nicknames of the United States",
          "parents": [
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        },
        {
          "kind": "place",
          "langcode": "en",
          "name": "Tennessee, USA",
          "orig": "en:Tennessee, USA",
          "parents": [
            "States of the United States",
            "States",
            "Places",
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            "Names",
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            "Proper nouns",
            "Terms by semantic function",
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          "source": "w"
        }
      ],
      "glosses": [
        "The official nickname for the state of Tennessee in the United States of America."
      ],
      "id": "en-Volunteer_State-en-name-haejDfSs",
      "links": [
        [
          "official",
          "official#English"
        ],
        [
          "nickname",
          "nickname#English"
        ],
        [
          "state",
          "state#English"
        ],
        [
          "Tennessee",
          "Tennessee#English"
        ],
        [
          "United States of America",
          "United States of America#English"
        ]
      ]
    }
  ],
  "word": "Volunteer State"
}

{
  "etymology_text": "Perhaps because of the prominent role of volunteer soldiers from Tennessee during the War of 1812; perhaps in reference to volunteers for the Mexican–American War.",
  "head_templates": [
    {
      "args": {
        "head": "Volunteer State"
      },
      "expansion": "Volunteer State",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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        "English multiword terms",
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        "English uncountable nouns",
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        "en:State nicknames of the United States",
        "en:Tennessee, USA"
      ],
      "glosses": [
        "The official nickname for the state of Tennessee in the United States of America."
      ],
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          "official#English"
        ],
        [
          "nickname",
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        [
          "state",
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        ],
        [
          "Tennessee",
          "Tennessee#English"
        ],
        [
          "United States of America",
          "United States of America#English"
        ]
      ]
    }
  ],
  "word": "Volunteer State"
}