IMO the easiest way to do that is: -offer a path to citizenship for the world -they have to pay something like $50k per person for a visa (or maybe $5k per year for 10 years) -must pay into social security, unemployment, etc. But can't draw any benefits until they are citizens. -if current on all obligations after 20 years, they are citizens. -can offer sponsorships for exceptions -something like 1 week approval (time for background check) $1k non refundable application fee.
Details can be changed, but this solves most concerns on the American right. We can see how far this gets us, but I suspect we would have a lot of global takers. Anyone willing to go for something like this I'm happy to have.