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by CivBase 461 days ago
> Of course, something in common with all the examples above, and with US citizens travelling to Mexico, is that you're travelling to neighbouring countries with friendly relations.

Militarily speaking, yes. But unlike the other examples, there is a huge economic difference between the US and Mexico, meaning migration flows exclusively one way. Illegal crossings are extremely common and the US has strong incentives to prevent them. It's hard to compare the US-Mexico border to any other border in the world.