America's traditional values of liberty and equality have recently been overshadowed by a new ideal: diversity. This ideal claims that group differences matter more than commonalities, personal freedom, and individual rights. In Diversity: The Invention of a Concept, Wood told the story of how this hitchhiker on the Constitution has gained popularity since the 1970s. Diversity Rules covers what happened after Justice Sandra Day O'Connor bestowed the Supreme Court's kiss of legitimacy on diversity in 2003. O'Connor opened the door to the promotion of identity politics, open borders, global citizenship, and the Green New Deal. More than a legal principle, diversity is a cultural edict that attempts to tell us who we are and how we should live.