The series documents 45 years of neglect of one of the most sweeping civil rights laws in our country's history. The investigation found that the federal government made a decision almost immediately after the passage of the 1968 Fair Housing Act not to enforce the key provisions of the law, including the mandate to promote residential integration. The stories and maps reveal how politics hobbled the reach of the law, severely limiting both the resources and the will of the U.S. Department of Housing and Urban Development to use its vast powers to force communities to undue decades of government-sanctioned segregation. It showed how HUD has from its roots been an agency conflicted about enforcing the law and how those charged with enforcement are undertrained and often maligned within the agency. As a result of the law's neglect by a succession of Republican and Democratic Administrations, our investigation found that segregation patterns in the cities with the largest proportion of black residents have barely budged.