Final answer:
Most case arguments are based upon the Civil Rights Act of 1964, a landmark civil rights and labor law that bans discrimination based on race, color, religion, sex, or national origin.
Step-by-step explanation:
The most case arguments are based upon the Civil Rights Act of 1964. This act is a landmark civil rights and labor law in the United States that bans discrimination based on race, color, religion, sex, or national origin. It also prohibits the unequal application of voter registration requirements and racial segregation in schools, employment, and public accommodations.