Columbia subject headings:
Europe--History--1989-
European cooperation.
National security--Europe.
Harvard subject headings:
Europe--History--1989-
European Union countries--Foreign relations--United States.
European Union countries--Foreign relations.
European Union countries--Military policy.
European Union countries--Politics and government.
European cooperation.
National security--Europe
National security--European Union countries
United States--Foreign relations--European Union countries.
Princeton subject headings:
European Union countries--Foreign relations--United States.
European Union countries--Foreign relations.
European Union countries--Military policy.
European Union countries--Politics and government.
National security--European Union countries.
United States--Foreign relations--European Union countries.