Shutting off US immigration is national suicide. Immigration is our superpower. It’s like a company deciding they don’t want any more customers. Utterly beyond idiotic.
As birth rates drop globally the countries that are magnets for the highest quality immigrants will explode and basically rule the world.
The kind of immigrants we get are the envy of the world too. I am a little more sympathetic to European concerns because the immigrants they are getting are coming for different reasons. Many of them are refugees not people coming because they genuinely want to be there, and that is a different deal entirely.