Final answer:
Race is a social category based on appearance or phenotypes, not biology. In the United States, race has been historically rooted in the slave economy, with Africans becoming preferred slaves due to their easily distinguishable appearance.
Step-by-step explanation:
Race is a social category based on a person's appearance or phenotypes. It is not biological, but rather a tool of discrimination, subordination, solidarity, and affirmative action. For example, in the United States, race was historically rooted in the slave economy, with Africans becoming the preferred source for slaves due to their easily distinguishable appearance. The concept of race has changed over time and varies across cultures and eras, often being based on superficial physical characteristics.