"blood quantum" meaning in English

{
  "forms": [
    {
      "form": "blood quantums",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "blood quanta",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "blood quantum (plural blood quantums or blood quanta)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
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          "name": "English entries with incorrect language header",
          "parents": [
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        {
          "kind": "place",
          "langcode": "en",
          "name": "Native Americans",
          "orig": "en:Native Americans",
          "parents": [
            "Canada",
            "United States",
            "North America",
            "America",
            "Earth",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The fraction of a person's ancestors, out of their total ancestors, who are documented as full-blooded Native Americans."
      ],
      "id": "en-blood_quantum-en-noun-U~oEKvyW",
      "links": [
        [
          "fraction",
          "fraction"
        ],
        [
          "ancestor",
          "ancestor"
        ],
        [
          "full-blooded",
          "full-blooded"
        ],
        [
          "Native American",
          "Native American"
        ]
      ],
      "raw_glosses": [
        "(US, sometimes proscribed, sometimes offensive) The fraction of a person's ancestors, out of their total ancestors, who are documented as full-blooded Native Americans."
      ],
      "tags": [
        "US",
        "offensive",
        "proscribed",
        "sometimes"
      ],
      "wikipedia": [
        "blood quantum"
      ]
    }
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  ],
  "word": "blood quantum"
}

{
  "forms": [
    {
      "form": "blood quantums",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "blood quanta",
      "tags": [
        "plural"
      ]
    }
  ],
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    {
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        "2": "blood quanta"
      },
      "expansion": "blood quantum (plural blood quantums or blood quanta)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English offensive terms",
        "English proscribed terms",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Native Americans"
      ],
      "glosses": [
        "The fraction of a person's ancestors, out of their total ancestors, who are documented as full-blooded Native Americans."
      ],
      "links": [
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          "fraction",
          "fraction"
        ],
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          "ancestor",
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        ],
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        "(US, sometimes proscribed, sometimes offensive) The fraction of a person's ancestors, out of their total ancestors, who are documented as full-blooded Native Americans."
      ],
      "tags": [
        "US",
        "offensive",
        "proscribed",
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      ],
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  "word": "blood quantum"
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