Columbia subject headings:
Harvard subject headings:
European Union countries--Emigration and immigration--Government policy--History--21st century.
European Union countries--Emigration and immigration--History--21st century.
Refugees--European Union countries--History--21st century.
Princeton subject headings:
European Union countries--Emigration and immigration--Government policy--History--21st century.
European Union countries--Emigration and immigration--History--21st century.
Refugees--European Union countries--History--21st century.