Gordon also explores the role of other policies and practices in sustaining segregation. Enforcement of private racial restrictions was held unconstitutional in 1948, and such agreements were prohibited outright in 1968. But their premises and assumptions, and the segregation they had accomplished, were accommodated by local zoning and federal housing policies. Explicit racial restrictions were replaced by the deceptive business practices of real estate agents and developers, who characterized certain neighborhoods as white and desirable and others as black and undesirable, thereby hiding segregation behind the promotion of sound property investments, safe neighborhoods, and good schools. These practices were in turn replaced by local zoning, which systematically protected white neighborhoods while targeting "blighted" black neighborhoods for commercial and industrial redevelopment, and by a tangle of federal policies that reliably deferred to local and private interests with deep investments in local segregation. Private race restriction was thus a key element in the original segregation of American cities and a source of durable inequalities in housing wealth, housing opportunity, and economic mobility.
Patchwork Apartheid exhaustively documents the history of private restriction in urban settings and demonstrates its crucial role in the ideas and assumptions that have sustained racial segregation in the United States into the twenty-first century.