Columbia subject headings:
Crises--Political aspects--European Union countries.
European Union countries--Economic integration.
European Union countries--Politics and government--21st century.
European Union--Membership--Political aspects.
European federation.
Nationalism--Europe.
Harvard subject headings:
Crises--Political aspects--European Union countries.
European Union countries--Economic integration
European Union countries--Politics and government--21st century.
European Union--Membership--Political aspects.
European federation
Nationalism--Europe
Princeton subject headings:
Crises--Political aspects--European Union countries.
European Union countries--Economic integration.
European Union countries--Politics and government--21st century.
European Union--Membership--Political aspects.
European federation.
Nationalism--Europe.