Final answer:
The American culture experienced significant changes post-WWII, including an increase in disposable income and leisure time, leading to more cultural and recreational activities and a shift towards suburban and consumer culture.
Step-by-step explanation:
According to the passage, American culture changed in the years following World War II as the nation witnessed unprecedented economic growth which led to more disposable income and increased leisure time for Americans. This in turn provided more opportunities for leisure and cultural activities. Americans enjoyed benefits such as paid vacations and a forty-hour workweek, affording them more choices in how they spent their free time. Innovations in technology and mass production, especially the automobile, increased mobility. With this new economic prosperity, Americans began to move towards embracing suburban living, consumer culture, and higher education. They also saw significant social and cultural shifts, like the breaking of the color line in Major Leagues baseball by Jackie Robinson in 1947.