My impression from living in the US for the last 25 or so years is that there is a general vibe that foreigners come to the US to work, Americans don't necessarily travel to other countries to work.
Never really heard any of my Canadian friends express reservations about moving to the US, and the European friends I've had never thought twice about moving to go to school and/or work.
It's definitely a generalization, but it's there in the ethos. America is the shining city on a hill.
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