"reverse one-drop rule" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "2008, Laura E. Gómez, Manifest Destinies: The Making of the Mexican American Race",
          "text": "The silence in American public discourse about the reverse one-drop rule as it governed Mexican Americans is significant.",
          "type": "quotation"
        },
        {
          "ref": "2015, José A. Cobas, Jorge Duany, Joe R. Feagin, How the United States Racializes Latinos",
          "text": "For Mexican Americans, the reverse one-drop rule operated to open up white status to Mexicans, and thereby the assumption of some political rights, but it also operated to impose a contingent whiteness.",
          "type": "quotation"
        }
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      "glosses": [
        "The notion that one drop of white blood (i.e. any white ancestry at all) makes a person white."
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          "white",
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        "(chiefly US) The notion that one drop of white blood (i.e. any white ancestry at all) makes a person white."
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  "word": "reverse one-drop rule"
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          "ref": "2008, Laura E. Gómez, Manifest Destinies: The Making of the Mexican American Race",
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