Columbia subject headings:
Europe--Foreign relations--1989-
Europe--Foreign relations--United States--History--21st century.
Europe--Politics and government--1989-
European Union.
United States--Foreign relations--Europe--History--21st century.
Harvard subject headings:
Europe--Foreign relations--United States
Europe--Politics and government--1989-
United States--Foreign relations--Europe
Princeton subject headings:
Europe--Foreign relations--United States--History--21st century.
Europe--Politics and government--1989-
United States--Foreign relations--Europe--History--21st century.