Who is included in the definition of an African American has evolved and continues to evolve in the United States. Your research strategies will need to consider who you intend to target.  

Go to the NYU Business Library's Marketing Information section for links to useful resources including links to the following suggested resources. 

MarketResearch: Go to the Demographics tab or run a text search "African American".

Mintel Reports: Go to Mintel Academic. Academic provides detailed consumer research, sales data and market information along with analysis, context and commentary. Under Mintel Academic, click on Trends or Category Overview, Multicultural.

You may want to consult the NYU Guide to Marketing. 

You may also want to review material found in the Pew Research Center website, African Americans.