Columbia subject headings:
United States--Civilization.
United States--Economic policy.
United States--Foreign relations.
United States--Politics and government.
Harvard subject headings:
United States--Civilization.
United States--Economic policy.
United States--Foreign relations.
United States--Politics and government.
Princeton subject headings:
United States--Civilization.
United States--Economic policy.
United States--Foreign relations.
United States--Politics and government.