Columbia subject headings:
African Americans--Civil rights--History.
Constitutional amendments--United States.
Slavery--Law and legislation--United States--History.
United States--History--Civil War, 1861-1865.
United States. Constitution. 13th Amendment--History.
Harvard subject headings:
Princeton subject headings:
African Americans--Civil rights--History.
Slavery--Law and legislation--United States--History.
United States--History--Civil War, 1861-1865.
United States. Constitution. 13th Amendment--History.