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Controlling the border is no problem at all. It's only a matter of will - just look at Israel.

So it only takes massive support from a superpower, being a tiny nation, building an actual wall and manning it, and spending an absolute fortune on defending it? http://www.haaretz.com/israel-news/business/israel-shells-ou...

This just in... Europe is quite a bit larger than Israel, and composed of different sovereign nations.