Columbia subject headings:
Slavery--United States.
United States--Politics and government--1845-1861.
United States--Politics and government--1861-1865.
United States--Politics and government--1865-1877.
Harvard subject headings:
Slavery--United States
United States--History--Civil War, 1861-1865
United States--Politics and government--1845-1861.
United States--Politics and government--1865-1877.
Princeton subject headings: