This is insanity. How can anyone believe in this?
Zero foreign students? Zero allowance for highly skilled professionals to move to the US and practice here? Zero allowance for immigrants to alleviate extreme labor shortages? Zero refugees? Like a Christian child refugee who will immediately be beheaded when you deport them, you'd have no problem with that? Zero family members? Even immediate? Just keep families separated for 25 years, unless they self-banish from their new homeland?
Not even Japan prohibits ALL immigration, like I could move there and work for a long period of time. It would almost be impossible to get citizenship or fully integrate, but there is not zero immigration.
Would you eventually crack down on tourist visas, because of the inevitability that family members would ignore your heartless ban, fly in on a tourist visa, and illegally overstay to live with their family members regardless of what the law says? As I would do without any shame at all. So we'd eventually just become a hermit kingdom like North Korea, where at best separated families can expect rarely given short term visits with each other in which they are monitored at all times to prevent violations.
You don't even really comprehend what you're asking for, and how alien and totalitarian it really is.