Columbia subject headings:
Chicago (Ill.)--Emigration and immigration.
Immigrants--Illinois--Chicago--Social conditions--21st century.
Immigrants--Spain--Madrid--Social conditions--21st century.
Madrid (Spain)--Emigration and immigration.
Spain--Emigration and immigration.
United States--Emigration and immigration.
Harvard subject headings:
Chicago (Ill.)--Emigration and immigration.
Immigrants--Illinois--Chicago--Social conditions--21st century.
Immigrants--Spain--Madrid--Social conditions--21st century.
Madrid (Spain)--Emigration and immigration.
Spain--Emigration and immigration.
United States--Emigration and immigration.
Princeton subject headings: