Final answer:
Approximately 31 million Americans were without health insurance in 2020, including workers in the leisure and hospitality industry such as restaurant workers.
Step-by-step explanation:
According to the information provided, approximately 31 million Americans were without health insurance in 2020. It is important to note that this number represents the total population and is not specific to restaurant workers. However, the passage mentions that many lower-paying jobs, including those in the leisure and hospitality industry, do not offer health insurance. Although it does not directly state the percentage of uninsured restaurant workers, it indicates that the industry has a low percentage of unionized workers, which may contribute to a lack of health insurance coverage.