I want to know the answer to the following question:
How are people defined as "black" or "white"?
All the background I'm provided with is that "Relatively dark-skinned people can be classified as white if they fulfill other social criteria of "whiteness", and relatively light-skinned people can be classified as black if they fulfill the social criteria for "blackness" in a particular setting.". Is that enough to answer the question?
Answer: yes