Columbia subject headings:
Harvard subject headings:
African Americans--History--1863-1877
Slavery--United States--History--19th century
Slaves--Emancipation--United States
United States--History--Civil War, 1861-1865--African Americans
United States--History--Civil War, 1861-1865--Participation, African American.
United States--History--Civil War, 1861-1865--Social aspects.
Princeton subject headings:
Race--History--19th century.
Slavery--United States--History--19th century.
United States--History--Civil War, 1861-1865.