Final answer:
Francine's refusal to sell her home based on race violates anti-discrimination housing laws, a legacy rooted in practices now prohibited but once prevalent as restrictive covenants and mortgage discrimination.
Step-by-step explanation:
Francine is specifically in violation of anti-discrimination housing laws by refusing to sell her home to an African American couple because of their race. Historically, practices like restrictive covenants and mortgage discrimination were used to maintain housing segregation and were outlawed due to their unconstitutional nature, following cases like Buchanan v. Warley in 1917. Even though the more overt forms of housing discrimination have declined, subtler forms persist today, as evidenced by studies from HUD showing disparities in properties shown to minority homebuyers.