Racial transformation is the process by which a demographic region (e.g., a country, neighborhood, or a school) changes in racial composition.
One example is the UK where the traditionally white population is declining over time and this will mean white Britons become a minority.https://www.prospectmagazine.co.uk/essays/54708/when-britain-becomes-majority-minority
See also Them: A Novel Transracial (identity)
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