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...have fun when all of the multinational companies move their main offices offshore so that they can bring in the people they want.
Multinational corporations do not have the best interests of the USA at heart, why should I care about them? I'm only interested in US companies.

And have fun explaining to sports fans that no foreigners are allowed.

If people are willing to subvert national interests for entertainment then trying to explain anything to them is likely to be fruitless.

There are two kinds of Americans: 1. Those who want America to be strong 2. Those who are too scared to have a strong America because they don’t want to be small fish (ie unemployed) in a big pond Which kind of American are you?

This is an overly simplistic and antagonistic framing of the argument that posits your hypothesis as fact. Importing cheap labor to offset the native workforce has not objectively helped America to be strong, quite the opposite in fact. Further, there is a vast difference between wanting to allow an "Einstein" to emigrate here, and wanting cheap labor that only serves corporate interests. Especially when those interests obviously are at odd with a strong and secure nation.