As far as nursing goes there are minimum course requirements. I'm not sure how one would pass the exam if whole areas of study (e.g. obstetrics) are missing.
It is getting harder and harder to enter illegally, too. Mexico was the normal path, but they are getting tougher on immigrants from other countries using theirs as a conduit. And, of course, I can't imagine you want to pick grapes and then move on to pick oranges. The national minimum wage is $5.65 per hour, with some states having higher minimums. Grape pickers aren't that well paid.
Remember, you are talking about a country with little in the way of social welfare systems and no national health system.
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