Columbia subject headings:
Constitutional amendments--United States.
Slaves--Emancipation--United States.
United States--History--Civil War, 1861-1865--African Americans.
United States. Constitution. 13th Amendment.
United States. Constitution. 14th Amendment.
United States. Constitution. 15th Amendment.
Harvard subject headings:
Constitutional amendments--United States
Constitutional amendments--United States.
Slaves--Emancipation--United States
United States--History--Civil War, 1861-1865--African Americans
United States. Constitution. 13th Amendment.
United States. Constitution. 14th Amendment.
United States. Constitution. 15th Amendment.
Princeton subject headings:
Slaves--Emancipation--United States.
United States--History--Civil War, 1861-1865--African Americans.
United States. Constitution. 13th-15th Amendments