The dangers of the contract sale system further illustrate why access to credit has always been essential to class mobility in the United States: while the availability of trustworthy loans to whites allowed them to pay off homes over time, predatory loans to African American people actually eroded their wealth and chances at class mobility. This differential access to credit was a direct result of government policy, and specifically of the disproportionate allocation of resources to white people and divestment of resources from African American people. This led to the conversion of formerly middle-class neighborhoods to slums, which is yet another reason to conclude that the ghettoization and deterioration of African American neighborhoods in the United States constitutes
de jure segregation.