Not as a democratic Republic of free citizens. The degree of isolation you describe could only be imposed by authoritarian, if not totalitarian, means.
Well, if they voted for it.
It would more involve keeping people out than keeping people in. The treatment of non-citizens has always been somewhat authoritarian.
But, as I said, they're not going to vote for it.
"However, many of our problems are caused by being too rich for our own good, and we might benefit by cutting back a little
Stultis
"Not as a democratic Republic of free citizens little"
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Ah but you see Proxy figures he would be one of the little galtleiters so for him Fascist America sounds like a wonderful idea. Too bad for him and the other little closet Hitlers on both the Left and Right, we got votes and the will to use them.