Which country has contributed the most to the foreign-born population of the united states?

The answer is Mexico.

Although other countries have a huge history of migrational movements, like India and China (which are the main protagonists of the phenomenon called 'brains migration', which means the migratory flux of highly qualified professionals from their country of origin), their targets are well distributed among other first world countries, like Canada, Australia, and central-western European nations.

However, Mexico, although not a relevant exporter of a highly qualified working force, due to proximity and the country's poor socioeconomic status, is the most contributor to the North-American foreign-born population. For decades, there have been huge illegal migrational movements of people that go to work in low-specialization jobs, like masons and maids.

the outcome of 1970 oil crisis in united states was that, they began to search ways on how to reduce oil.

in 1970 was a period when there were energy and oil crisis. those who were major centers for industrialization were forced to keep way from supplying of petroleum.

some of the result of this crisis was economic growth became stagnant because prices of oil surged.

due to the increased prices some countries like mexico and norway benefited.