The Border Crisis Won't Be Solved at the Border

It's the same situation in most countries.

You need young, cheap labour from somewhere in order to sustain domestic agricultural and manufacturing industries. In the US it comes from people crossing the border, UK it was Schengen migration and in Australia legal immigration via loopholes that were never closed.

And as we've seen in the UK the minute that goes away those businesses fold en masse as either (a) they make themselves uncompetitive to attract domestic workers or (b) they don't and they have no workers at all.

UK was never part of Schengen. Freedom of movement is for all EU citizens not just the Schengen countries

And net migration hit record levels post Brexit.