Columbia subject headings:
Balkan Peninsula--Politics and government--1989-
Europe--Foreign relations--United States.
Europe--Politics and government--1989-
North Atlantic Treaty Organization--Membership.
United States--Foreign relations--Europe.
Harvard subject headings:
Balkan Peninsula--Politics and government--1989-
Europe--Foreign relations--United States.
Europe--Politics and government--1989-
North Atlantic Treaty Organization--Membership.
United States--Foreign relations--Europe.
Princeton subject headings:
Balkan Peninsula--Politics and government--1989-
Europe--Foreign relations--United States.
Europe--Politics and government--1989-
North Atlantic Treaty Organization--Membership.
United States--Foreign relations--Europe.