Final answer:
The American diet changed as the country became more urbanized, with people relying more on processed and convenience foods. This shift in dietary habits contributed to the rise of obesity and other health issues.
Step-by-step explanation:
The American diet underwent significant changes as the country became more urbanized. As jobs attracted migrants to cities during the industrialization period, people started relying more on processed and convenience foods. The emergence of technologies like frozen meals and TV dinners made it possible for individuals to have quick and easy meals without needing to cook from scratch. This shift in dietary habits contributed to the rise of obesity and other health issues.