Really? Who controls it? You don't. I don't. Who sets the numbers of immigrants? Is there an upper limit? A lower limit/yr? You don't know squat and either do I AND THAT IS THE PROBLEM.
The FEDS DO.
It’s called the Immigration and Naturalization Service.
They’ve been doing it since the days of Ellis Island.
I have taught folks that were cleared for entry by INS, from Soviet Russia.