“to racially balance the nation, ZIP code by ZIP code . . . . and publish ‘geospatial data’ pinpointing racial imbalances. . . . Federally funded cities deemed overly segregated will be pressured to change their zoning laws to allow construction of more subsidized housing in affluent areas in the suburbs, and relocate inner-city minorities to those predominantly white areas. HUD’s maps, which use dots to show the racial distribution or density in residential areas, will be used to select affordable-housing sites.” (emphasis added).