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Well...South Korea is a narrow peninsula with a huge demilitarized zone between it and North Korea. Israel is also a small country and they have had some PR problems with their militaristic enforcement policies. India and China have a border dispute but are separated by the Himalayas, and also they both have nuclear weapons. India and Pakistan's dispute over Kashmir is the cause of frequent violence.

These are not good models for a ~2000 mile border with a basically friendly neighbor. Economic theory suggests that free trade works best if it includes labor markets.

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