Final answer:
Title VII of the Civil Rights Act of 1964 is the most prominent piece of legislation regarding HRM.
Step-by-step explanation:
The most prominent piece of legislation regarding HRM is Title VII of the Civil Rights Act of 1964. This act outlawed discrimination in employment based on race, color, national origin, religion, and sex. It created the Equal Employment Opportunity Commission to investigate and enforce these provisions. The act is considered one of the most significant civil rights laws in US history.