His shop straddles the US-Canada border. A historic friendship is crumbling on both sides.

Canada said it had been attacked. The US said it had been ripped off for years. And on the exact border between the two, Louis Patenaude had boxes to sort. In the throes of a heated trade war, Half-Way House Freight Forwarding was still open. Patenaude’s business is a simple one, made possible by...

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