Final answer:
The Civil Rights Act of 1964 preceded the NAD allowing Black Deaf people to join the organization.
Step-by-step explanation:
The event that preceded the National Association of the Deaf (NAD) allowing Black Deaf people to join the organization was the signing of the Civil Rights Act of 1964.
Before this act was signed into law, racial segregation was prevalent in many areas of society, including education. The civil rights movement fought for equal rights and opportunities for all individuals, regardless of their race, and the Civil Rights Act of 1964 aimed to eliminate racial discrimination and segregation.
Once this act was established, it provided the legal framework for organizations like the NAD to promote inclusivity and equality by allowing Black Deaf people to become members.
Learn more about Civil Rights Act of 1964