Columbia subject headings:
United States--History--Civil War, 1861-1865--Participation, African American.
United States--Race relations.
United States. Army--African American troops--History--19th century.
United States. Army--History--Civil War, 1861-1865.
Harvard subject headings:
African Americans--History
United States--History--Civil War, 1861-1865
United States. Army--African American troops--History--19th century.
Princeton subject headings:
United States--History--Civil War, 1861-1865--Participation, African American.
United States--Race relations.
United States. Army--African American troops--History--19th century.
United States. Army--History--Civil War, 1861-1865.