How did the economic crises after 1970 impact the gains made in the 1960s by most black Americans?

Assignment instructions HIS325r:
Discussion:

Examine the effect of economic crises in the 1970s and 1980s on African American society and race relations in the United States.
Based on the discussion  provide a response to the following question.

How did the economic crises after 1970 impact the gains made in the 1960s by most black Americans?