> It should not be possible to hire foreign workers into entry level positions at all.

And with that, you perhaps got rid of a (imo) very useful subset of potential future Americans: ones who went to college and graduate school in the US.

This group went through it’s formative years in the United States. They are deeply imbibed in the culture and eventually start identifying with it. However, if they can’t get an entry level job, they now have to leave the country to go back to where they came from (or some other alternative like Canada / Australia). Instead, you would rather be bringing in 30 year olds from foreign nations who are unlikely to change and adopt America as much as someone who moved here at 18 would; and who have formed habits more suited to their nation than to the US.

But as I mentioned above, perhaps this is desireable.