If you could literally sign an order right now to completely remove any control on who could come and work in your state (setting aside criminal records, diseases etc), would you do that?
I think you would probably not, because you know it would be a war zone within weeks, with the poorest and most desperate people from all around the world swarming to your small part of the world, bringing with them huge social issues.
Does that happen now? There are plenty of poor, desperate people all over America, do they "swarm" the more affluent areas? Do we have poor people from rural Pennsylvania coming to Los Angeles and undercutting hard-working Californians?
I would. With background checks for criminal records.
People who have the wherewithal to move across the globe are not "the poorest and most desperate people from all around the world", they are the ones with the means to pay thousands of dollars to mafias because we have no better system to bring them in.
I think you would probably not, because you know it would be a war zone within weeks, with the poorest and most desperate people from all around the world swarming to your small part of the world, bringing with them huge social issues.