["HISTORY \/ Military \/ Wars & Conflicts (Other)","HISTORY \/ United States \/ Civil War Period (1850-1877)","TECHNOLOGY & ENGINEERING \/ Military Science","African Americans;History.","United States;History;Civil War, 1861-1865;Participation, African American.","United States;Race relations.","African Americans;History.","BLACKS IN THE U.S.","GENERAL","HISTORY \/ Military \/ Wars & Conflicts (Other)","HISTORY \/ United States \/ Civil War Period (1850-1877)","History\/American","MILITARY HISTORY - U.S. CIVIL","Non-Fiction","Scholarly\/Undergraduate","TECHNOLOGY & ENGINEERING \/ Military Science","United States","United States;History;Civil War, 1861-1865;Participation, African American.","United States;Race relations."]