The ancestry of African Americans is predominantly from Niger-Kordofanian (~71%), European (~13%), and other African (~8%) populations.    From Wordnik.com.  [Archive 2009-05-01] Reference

That last bit of info, "The ancestry of African Americans is predominantly from Niger-Kordofanian (~71%), European (~13%), and other African (~8%) populations", that is of such potential importance to those doing family geneological research.    From Wordnik.com.  [African genetic diversity] Reference

The data shows that African-Americans are descended primarily from Niger-Kordofanian ancestors.    From Wordnik.com.  [Health News from Medical News Today] Reference

West Africans speaking the Niger-Kordofanian language were found to share many genetic traits with African-Americans, indicating they were the ancestors of most of the slaves sent to the New World.    From Wordnik.com.  [WN.com - Articles related to Political Fraud Exposed for GM crops approved in Western Australia January 2010] Reference

It was found that the ancestry of African Americans is mainly from Niger-Kordofanian (71\%), European (13\%), and other African (8\%) populations, although admixture levels varied considerably among individuals.    From Wordnik.com.  [GenealogyBlog] Reference