Columbia subject headings:
Northwest, Old--History.
United States--Commerce--History.
United States--History--1815-1861.
United States--Politics and government--1815-1861.
Harvard subject headings:
Northwest, Old--History.
United States--Commerce--History.
United States--History--1815-1861.
United States--Politics and government--1815-1861.
Princeton subject headings:
Northwest, Old--History.
United States--Commerce--History.
United States--History--1815-1861.
United States--Politics and government--1815-1861.