Americans are understandably squeamish about official racial and ethnic classifications. Nevertheless, they are ubiquitous in American life. Applying for a job, mortgage, university admission, citizenship, government contracts, and much more involves checking a box stating whether one is Black, White, Asian, Hispanic, or Native American.  Professor Bernstein discusses the surprising history of American racial classifications from research findings for his new book: Classified: The Untold Story of Racial Classification in America.