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Yes, but there would be a lot more of other kinds of dispute the vast diffirences of juristictions, cultures and economies that would suddenly be set free to clash against each other.
In our current state, it'd seriously be too much trouble for what it's worth.
I'm all in for open borders, but diffirent parts of the worlds have diffirent flavours of society, and I think those are all best left contained in their respective areas by their own juristictions so people who enjoy that flavour can seek it out, and those who despise it can keep out of it.