The jobs that you just mentioned and those positions usually come from Europe and not from South America. Doctors, Lawyers, Engineers both electrical and mechanical, Nurses, Machinists, and Scientists are all college degree type positions aside from a machinist which is a skilled trade. People from Venezuela and Honduras and places like that are usually menial type workers like cooks and hotel, motel staff and things like that.
While mostly true, it is a generalization and stereotypical. There are educated people in all partsoftheworld.