As anyone who has studied the American Constitution knows, the American Government was designed to move very slowly. Before we dismantled them the checks and balances deal made it even slower. But radical change is all but impossible.
I happen to have family members including my own son who would refuse to travel there even if it was free
Irregardless, we still have a lot more people applying to get in then we have people getting out. It's not Mexico worrying about people crossing the border in waves.
And, there is not one America, there are many, some existing with in each other.
In a micro view, there was a post recently asking about 'California' in some general way, and people, those of us who live here, and love it, kept trying to say that there is no one Cali, there is a dog pile of Cali. Which, considering that the state is pretty much the same area as Savanna GA to NYC, ought to be expected.