I'm sharing an audio link for a radio interview conducted with the founding director of the African American Civil War Memorial and Museum Foundation.

The best kept secret of American history is revealed here.

DC Boasts US Largest Exhibit On Blacks In Civil War
http://www.npr.org/2011/06/27/137448910/dc-boasts-us-largest-exhibit-on-blacks-in-civil-war?sc=emaf