Columbia subject headings:
Political science--United States--History--19th century.
Political science--United States--Philosophy--History--19th century.
Realism--Political aspects--United States--History--19th century.
United States--Foreign relations--19th century--Philosophy.
United States--Politics and government--19th century--Philosophy.
Harvard subject headings:
Political science--United States--History--19th century.
Political science--United States--Philosophy--History--19th century.
Realism--Political aspects--United states--History--19th century.
United States--Foreign relations--19th century--Philosophy.
United States--Politics and government--19th century--Philosophy.
Princeton subject headings: