Columbia subject headings:
United States--Foreign relations.
Harvard subject headings:
Arms control
United States--Economic conditions--1981-2001.
United States--Foreign economic relations.
United States--Foreign relations--1989-
United States--Social conditions--1980-2020
Princeton subject headings:
Constitutional law--United States.
Constitutions--United States--States.
United States--International relations.
United States--Territorial expansion.