But it's not quite that simple, is it? You can change the culture of a child by forcibly separating them from their parents, putting them in a boarding school,

But it's not quite that simple, is it? You can change the culture of a child by forcibly separating them from their parents, putting them in a boarding school, beating them when they try to speak their mother tongue with other children, and so on, methods that have been successfully applied in Australia and Canada, I believe. Changing the culture of an adult is more difficult, though they may have tried similar methods rather more recently in ... you know where. You can to a certain extent change your "race" simply by changing your dress, hairstyle and name, provided your physical appearance is roughtly consistent with several "races", which is not an unusual situation in many of the societies in which "race" is a thing.