Columbia subject headings:
Douglas, Stephen A. (Stephen Arnold), 1813-1861.
Northwest, Pacific--History.
Slavery--United States--Extension to the territories.
United States--Politics and government--1845-1861.
Harvard subject headings:
Douglas, Stephen A. (Stephen Arnold), 1813-1861.
Northwest, Pacific--History.
Slavery--United States--Extension to the territories
United States--Politics and government--1845-1861.
Princeton subject headings:
Douglas, Stephen A. (Stephen Arnold), 1813-1861.
Northwest, Pacific--History.
Slavery--United States--Extension to the territories.
United States--Politics and government--1845-1861.