Entering the United States, or any nation, is a privilege, not a universal
right. Any nation has the right to control who it allows to come in, and
who
it decides to keep out.

Not to detract from the current discussion... but...

I'm a Canadian. I would *LOVE* to move to the US, become a citizen, pay
taxes, etc. Doing so is pretty much impossible, unless I want to spend years
going to school. Canadians can't even participate in the VISA lottery.

Considering that my wife and I earn over $100,000/year, I doubt we'd be any
burden.