Columbia subject headings:
European Union countries--Emigration and immigration--Government policy.
United States--Emigration and immigration--Government policy.
Harvard subject headings:
European Union countries--Emigration and immigration--Government policy.
United States--Emigration and immigration--Government policy.
Welfare state--European Union countries.
Welfare state--United States.
Princeton subject headings:
European Union countries--Emigration and immigration--Government policy.
United States--Emigration and immigration--Government policy.