Final answer:
Approximately 10.7% of all U.S. workers belong to unions, which means that one in ten American workers is a union member.
Step-by-step explanation:
According to the U.S. Bureau of Labor and Statistics, about 10.7% of all U.S. workers belong to unions. This means that one in ten American workers currently belongs to a union. These union membership rates vary across different demographics, occupations, and age groups, but on average, approximately 10% of the workforce is unionized.