Sociologist Orly Clergé’s 2019 book The New Noir: Race, Identity & Diaspora in Black Suburbia includes the history of Blacks moving to New York and its suburbs. In her study, Clergé talks to both Black residents and white residents of suburban communities. Here is how Clergé responds to the claim by some white residents that their families left neighborhoods spontaneously as Black residents moved in:
Although White flight is discussed as a spontaneous response to Black in-migration, White fight and flight were well thought-out, collective, strategic, and immoral acts against Black people condoned by the state. (101)
White flight is the American phenomena where white residents left urban neighborhoods for the suburbs when Blacks and other racial or ethnic minorities moved in. This is most common in the decades after World War Two when government policy and community changes combined to lead to often rapid turnover in cities. In some Chicago neighborhoods, the population moved from +90% white to a significant Black majority in just a decade or two.
A number of studies explain how white flight happened in particular cities such as in Detroit as detailed by Sugrue in The Origins of the Urban Crisis or Atlanta as discussed by Kruse in White Flight. White flight affected all areas of life, ranging from the suburbanization of jobs as Wilson highlights in When Work Disappears and the move of white churches to the suburbs (an area I have done a little work in with a study of Protestant denominations in the Chicago region).
What the quote above highlights is just how prepared white residents were regarding potential changes in their neighborhood. Over the course of at least a few decades, whites deployed a range of techniques that culminated in white flight: restrictive deeds and covenants, blockbusting, redlining, and threats and violence. As each of these techniques was rendered illegal or went against public opinion, white residents moved onto the next option. And white flight was eventually the choice as white residents left en masse. It did not just happen; it was part of well-established patterns of exclusion that would then continue in suburban communities.