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Let us assume this is correct. Japan chose from the 17th century to the middle of the 19th century to reduce connections with the outside world and didn't succeed.
Cuba had famously many people escaping the country so they didn't stop the outflow.
During covid, people could still go from Argentina to Uruguay through the Rio de la Plata river.
So my conclusion: I have some doubts about your comment, see above some counter-examples.
However if your point is stopping mass immigration in Europe because of war, then yes I am convinced this is a problem of choice. Although some people will find loopholes so totally I don't think this is possible, and I am not against voluntary and lawful immigration.

The problem in Europe is the political leaders choose to import third world immigrants when the voters have said no. Same with America.

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Yes, it means there will eventually be new ornaments on trees and lampposts!! They will get what they earned.

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I have examples too

North Korea border

Berlin Wall

Great Wall of China

12 million unlawful immigrants into USA since 2021 and USA can’t stop it? Let’s see what happens after January 20

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I am curious to know as well. For unlawful immigration I have no doubt it can be stopped.

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There are always rifles. They seem to work very well for stopping illegal immigration.

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Landmines and IEDs work in Korea, 38th parallel

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I guess the more impersonal the better in cases where murder is desired.

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I don't consider this murder. If anyone is foolish enough to cross 38th parallel, they almost deserve it. They can't say they were deceived

Those barriers exist for a reason. Don't mess with Chesterton's fence

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Yes, good fences make good neighbors. We can really notice that when there are no fences. I guess this is the exact reason that Indians make hug walls around their properties in the cities.

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The Great Wall of China, interestingly enough, has the battlements facing the interior of China not Tartaria. It may have been the Tartarians that built the wall to keep the Chinese on their side of the wall.
I have to say those walls by-and-largely worked. You forgot to mention the walls around our friend Israel. They work very well until they break them down with tanks.

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Japan succeeded with he closure all through the Tokugawa Bakufu. It was only opened up by the outside with the force of cannons. They would have gone along with it for as long as they could have. A better example would be China closing itself by destroying all of its blue water ships.
Poland has found a way to stop all immagration coming into the country: they have authorized the boarder guards to shoot to kill. That’s how they are defending the boarders.

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