What are the different policies the united states has had toward the flow of laborers over the mexican-u.s. border?
what conflicts exist between the needs of business, humanitarian efforts, and the socioeconomic conditions in mexico?

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President Trump signed this Friday an executive order to forbid immigrants to cross the border illegally asking for asylum, the new rule is covered by section 212 of the United States Immigration Act, which describes the causes of inadmissibility of certain foreigners. President Trump could issue a proclamation, for as long as he considers necessary, to suspend the entry of foreigners, immigrants or not, and impose "any restriction that he considers appropriate."

Though, these restrictions had become the former policy for immigration nowadays, In the past, around 1890’s the raising of new industries in the US Southwest attracted Mexican and south Americans migrant laborers, as well the Mexican revolution in 1910 and the years after showed a increase in the flow of immigrants from the Mexican border to U.S.  

During president Obama’s administration, according to data from the Immigration Policy Unit of the Secretariat of the Interior (Segob) of Mexico, in the first six months of 2018, the US authorities deported 109,296 Mexicans, most of them through border posts in Baja California and Tamaulipas.

For both countries these actions impact directly the economy, as for Mexico, the revenues received from the US represent the second main source of income just after oil, while for US, it is known that not only Mexican but in general, Latin American workers are considered strong, resilience, adaptable to extreme condition of work in farms, construction, home keeping among several other areas where Americans don’t want to work due to hard conditions.