Civil Rights Act of 1968 - Wikipedia https://en.wikipedia.org/wiki/Civil_Rights_Act_of_1968#Title_VIII%E2%80%93IX:_Fair_Housing_Act

"Refusal to sell or rent a dwelling to any person because of their race, color, religion or national origin. Discrimination on the basis of sex was added in 1974, and people with disabilities and families with children were added to the list of protected classes in 1988."