Final answer:
Teen culture in the 1950s was shaped by research on adolescence, youth-oriented media, targeted advertising, and the rise of affordable automobiles. Rock and roll music notably blurred racial lines and encouraged social integration, becoming a symbol of rebellion.
Step-by-step explanation:
Teen culture emerged in the 1950s through a combination of factors. These included research on adolescence, which helped to define the teenage years as a distinct phase of life, and youth-oriented movies and new music genres, such as rock and roll, which appealed to the tastes of younger audiences.
Advertising increasingly targeted teenagers, acknowledging their growing economic influence and distinct interests. The availability of affordable automobiles gave teens a sense of freedom and mobility, further shaping their distinct culture.
However, rap music did not contribute to the emergence of teen culture in the 1950s as it developed later, in the 1970s and 1980s.