So, does your map imply that the caravans will come into the US via boat? Actually, quite a few Chinese come in to the US, have birth-right babies and overstay their visas.
Walls can be outflanked, surmounted and tunneled under. The whole point of the wall is to make illegal crossings more expensive and difficult.
So he came south with his harem of catamites, and his Stuart dynasty plunged my ancestors into three civil wars in 150 years, until they finally ran James II out of town in 1688.
But the tradition he established, of paying Scotland's debts with England's money, continues to this day. Perhaps when the Old Country cuts itself free of Europe, it will follow through by cutting itself free of Scotland.
"and nought shall make us rue / if England to herself do rest but true."