Why not JUST enforce the existing laws... ?
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Because like most of the laws of this country, they are unenforceable and subject to buracratic jerry-rigging.
We need tougher laws:
this is how you get in, this is how many we will accept and this is how much capital you need to bring with you in order to qualify for citizenship. A couple of million US would do it. No one else.
If I remember correctly, before coming into this country one had to prove they were financially self-supporting or have some kind of citizen sponsor.
Did that go away?