Columbia subject headings:
Slaves--Emancipation--United States.
United States--History--Civil War, 1861-1865--African Americans.
Harvard subject headings:
Slaves--Emancipation--United States
United States--History--Civil War, 1861-1865--African Americans
Princeton subject headings:
Slaves--Emancipation--United States.
United States--History--Civil War, 1861-1865--Participation, African American.