Columbia subject headings:
European Union countries--Economic conditions--21st century.
European Union countries--Foreign relations--21st century.
European Union countries--Politics and government--21st century.
European Union countries--Social conditions--21st century.
European Union--Forecasting.
European Union--Membership.
Harvard subject headings:
European Union countries--Foreign relations.
European Union countries--Politics and government.
European Union--Public opinion.
Princeton subject headings: