What are the advantages and disadvantages to the current US system of immigration when it comes to the countrys economic needs?

Fully industrialized countries often have native-born birthrates below the replacement level necessary to sustain the current population. Some of these also have very restrictive immigration and guest worker programs, like Japan and, to a degree, the US. What are the advantages and disadvantages to the current US system of immigration when it comes to the countrys economic needs?

Cite at least 3 sources, in addition to the book Far Away Brothers

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