My perspective may be different because I probably grew up around more immigrants than anyone here just by virtue of the fact that I'm from the East Side of Detroit. This was like immigrant central because of the auto plants. That's why I believe I should be the sole decider of which groups get to settle here and which groups should be torpedoed at sea before they reach our shores.
So to review: People of European descent whether Christian or Jew.... OK. People of Eastern Asian descent excluding most Chinese...OK Some Cubans, Mexicans and South Americans...ok. Some Arabs (Christian only) are ok. And of course there are a smattering of exceptions to the rules, miscellaneous other groups that produce venerable examples and so forth. I'm speaking in generalities.
The rest have simply been neglected by evolutionary forces and are therefore best suited to those areas where they are indigenous ie Equatorial Africa, South Asia, etc etc