Final answer:
The move to cookie-cutter houses in the suburbs after World War II is best symbolized by Levittown, representing the American dream and suburban growth, which was facilitated by government incentives, the advent of personal transportation, and portrayed in popular culture.
Step-by-step explanation:
The post-World War II demographic change of moving to cookie-cutter houses in the suburbs is best symbolized by the development of Levittown. In the 1950s, the suburbs exploded on the American landscape, with many families leaving the crowded cities for new homes in the suburbs that offered bigger yards, new schools, and a sense of community. The shift was supported by government policies with financial incentives and suburban growth became synonymous with achieving the American dream. While the suburbs offered benefits like good schools and safe environments, this migration also had unintended consequences, such as the reduction of tax bases in cities and a shift in cultural representation from urban to suburban life in popular media. Ultimately, the move to the suburbs in the postwar period was a result of a combination of factors including economic prosperity, technological innovations in transportation, and federal support for homeownership.