People move a lot and become immigrants in other countries. Many immigrants, in every historical time frame, come to countries without an prior knowledge of the language. However, they usually learn the language.
My question is: for first generation immigrants who don't have an education, that is, they haven't gone to school/university, is it more difficult to acquire the language? You can expect them to have no metalinguistic knowledge. Does this affect the quality of their acquired language, with respect to educated/qualified immigrants?