Fwiw, for the most part I agree with Delina D. Pryce's statement that racial categories and ethnic categories are largely inaccurate and silly in this day and age. For example, I have repeatedly written-on this forum and elsewhere-that it is a racist construct to believe that one drop of 'black blood' makes a person Black. This has long been the social if not the legal definition for who is or is not a Black American. The implication of the 'one drop of black blood' maxim is that Black African ancestry is a highly negative condition; 'Black blood' is so tainted that even one drop pollutes the blood stream in perpetuity.

I have often said-with some degree of facetitiousness but also seriously- that perhaps the only way to eradicate the exclusive definition of the White race is for people who know that they have first and second and third generation White ancestry to insist that they are White-regardless of how dark or light their skin is.

I have also said-on this forum and elsewhere- that-in my opinion, it is the positive and negative values ascribed to races that are the problem and not racial categories as descriptors of individuals and groups of people.

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Also, fwiw, I don't agree with Delina D. Pryce's statement [that I've read elsewhere] that "Racism is prejudice combined with power".
Generally speaking, Black and Brown people are powerless. Yet there are Black and Brown individuals and groups who act and think in racist ways.

I would agree with Pryce's statement if she had written that institutional racism is prejudice combined with power.

Definitions of Institutional racism on the Web include:

"Those forces, social arrangements, institutions, structures, policies, precedents and systems of social relations that operate to deprive certain racially identified categories equality" .
www.socialpolicy.ca/i.htm

or "structural racial discrimination -- racial discrimination by governments, corporations, or other large organizations. (eg Mary cannot get a job, despite her qualifications, because she is of race Y.)"
www.politicalinformation.net/encyclopedia/Racism.htm

"Institutional racism (or structural racism) is a form of racism that occurs in institutions such as public bodies and corporations, including universities."
en.wikipedia.org/wiki/Institutional_racism