Columbia subject headings:
European Union countries--Economic conditions--21st century.
European Union countries--Politics and government--21st century.
European Union.
Harvard subject headings:
European Union
European Union countries--Economic conditions--21st century.
European Union countries--Politics and government--21st century.
Princeton subject headings:
European Union countries--Economic conditions--21st century.
European Union countries--Politics and government--21st century.
European Union.