One crossing, San Ysidro, sees 20,000 northbound pedestrians every day. One crossing. And 70,000 northbound vehicles every day. All legal. One crossing.
And as for Canada, nothing could be easier than crossing that border. This is a street in my hometown...
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On the right is Canada. The street on the left is in Blaine, Washington. The little aluminium obelisk marks the border.
America can't be bothered to put up a chain-link fence but Trump says Canada should stop people stepping across into the USA.