Yes, you only have to look back at World War 2. Even for the brief period where Jews were allowed to leave Germany, America capped jewish immigration to 30,000 per year.
I find that word very offensive...yet you made me spit out a mouthfull of sunflower seeds in laughter when I read this. Oh, read the book if you havent.
I think a war with the USSR was a lot more likely during that era than a total social and economic collapse is today.
And there's nothing wrong with it on the community level. Think Amish, a church community, or a kibbutz in Israel. I have no problem with it.
Although I can see how on ET it might be construed otherwise, I wasn't making a judgement, merely offering an observation.