Columbia subject headings:
Panama--Foreign relations--United States.
United States--Foreign relations--Panama.
Harvard subject headings:
Panama--Foreign relations--United States.
Panama--History--American Invasion, 1989.
United States--Foreign relations--Panama.
Princeton subject headings:
Panama--Foreign relations--United States.
Panama--History--American Invasion, 1989.
Panama--Politics and government--1981-
United States--Foreign relations--Panama.