"one-drop rule" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "derived": [
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          "word": "reverse one-drop rule"
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      "examples": [
        {
          "ref": "2008 April 6, Beverly Gage, “Our First Black President?”, in New York Times, retrieved 2017-01-08:",
          "text": "[T]he notorious historian William Estabrook Chancellor […] helped assemble a controversial biographical portrait accusing President Warren Harding of covering up his family’s “colored” past. […] Under the one-drop rule of American race relations, Chancellor claimed, the country had inadvertently elected its “first Negro president.”",
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        {
          "ref": "2021 November 7, Claire [G.] Coleman, “Not quite blak enough: ‘The people who think I am too white to be Aboriginal are all white’”, in The Guardian:",
          "text": "It was the wadjelas that created the ‘one drop’ rule, that defined anybody with a single bla(c)k ancestor as black. They did that to separate people, to create a caste system, to protect the notion of whiteness, to protect whiteness from the merest ‘impurity’, from the merest influx of colour.",
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      "glosses": [
        "The notion that one drop of black blood (i.e., any African ancestry at all) makes a person black."
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        "(chiefly US) The notion that one drop of black blood (i.e., any African ancestry at all) makes a person black."
      ],
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        {
          "word": "miscegenation"
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          "ref": "2008 April 6, Beverly Gage, “Our First Black President?”, in New York Times, retrieved 2017-01-08:",
          "text": "[T]he notorious historian William Estabrook Chancellor […] helped assemble a controversial biographical portrait accusing President Warren Harding of covering up his family’s “colored” past. […] Under the one-drop rule of American race relations, Chancellor claimed, the country had inadvertently elected its “first Negro president.”",
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          "ref": "2021 November 7, Claire [G.] Coleman, “Not quite blak enough: ‘The people who think I am too white to be Aboriginal are all white’”, in The Guardian:",
          "text": "It was the wadjelas that created the ‘one drop’ rule, that defined anybody with a single bla(c)k ancestor as black. They did that to separate people, to create a caste system, to protect the notion of whiteness, to protect whiteness from the merest ‘impurity’, from the merest influx of colour.",
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        "The notion that one drop of black blood (i.e., any African ancestry at all) makes a person black."
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