Columbia subject headings:
Agricultural laborers, Foreign--United States.
Illegal immigration--Mexico.
Illegal immigration--United States.
Immigrants--United States.
Mexico--Emigration and immigration.
Migrant labor--United States.
Noncitizens--Mexico.
Noncitizens--United States.
United States--Emigration and immigration.
Harvard subject headings:
Foreign workers, Latin American--United States.
Human smuggling--Mexico.
Human smuggling--United States.
Labor demand--United States.
Latin America--Emigration and immigration--Economic aspects.
United States--Emigration and immigration--Economic aspects
Princeton subject headings:
Foreign workers, Latin American--United States.
Human smuggling--Mexico.
Human smuggling--United States.
Labor demand--United States.
Latin America--Emigration and immigration--Economic aspects.
United States--Emigration and immigration--Economic aspects.