At which point in time in the U.S. was movement out of the city first associated with movement up the social scale, setting the social distinction between suburbs and city?

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The 1920s marked the beginning of the suburbanization trend in the United States, when an increasing number of white middle-class families began to move out of the crowded and polluted cities to newly built, spacious and affordable suburbs. This demographic shift was largely driven by the availability of the automobile, which made it easier for people to commute from their homes in the suburbs to work in the city. This period also marked the emergence of the suburban lifestyle, which was associated with the middle-class values of privacy, family, and homeownership - all of which became symbols of upward social mobility. Thus, the movement out of the city became synonymous with a rise in social status, setting the social distinction between suburbs and city that persists to this day.

At Which Point in Time in the U