Final answer:
The area that was NOT one of significant advancement for African Americans in "Reagan's America" was the prosperity of Black middle and upper class at higher rates than white households.
Step-by-step explanation:
In "Reagan's America," the area that was NOT one of significant advancement for African Americans was "D. Black middle class and upper class prospered at rates higher than white households." While there was a growth in the number of black Americans joining the ranks of the middle class, a positive legacy stemming from the civil rights movement and policies like affirmative action, the 1980s were also marked by economic inequality and challenges for the African American community. Employment opportunities did rise, but the unemployment rate for Black people was nearly twice as high compared to White people, notably due to declines in the manufacturing sector and a retreat in support for affirmative action. This contributed to a widening economic gap between different social groups. Political representation and cultural advancements did occur during this time, yet African Americans did not prosper at rates higher than white households; rather, they faced an organized assault on urban black communities, loss of jobs, a reduction in federal grants for community programs, and the introduction of crack cocaine.