Talking housing segregation and public policy. Richard Rothstein is the author of "The Color of Law," a book about a forgotten history of how the government segregated America. Rothstein discussed his book and how the segregation in our cities was caused by different government policies, not the preferences of residents. From the federal level down to local zoning and urban renewal decisions Rothstein argues that the government caused segregated neighborhoods in patterns that violate the Constitution and require remediation.