As the United States becomes more multiracial, the document discusses the changing definitions and perceptions of race over time. It notes that race is a social construct rather than biological reality. Through increased immigration, interracial marriage, and legal decisions like Loving v. Virginia, the U.S. population and acceptance of multiracial identities have grown. The document profiles many prominent multiracial Americans and predicts that multiracial individuals will likely be the majority of the U.S. population by 2050.