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In the late 1600s, as hostilities between England and France built up, Parliament at Westminster took the step of moving from tariffs on French wine to an outright ban. The result was that French wine went from being 70% of the wine Britain imported prior to the Nine Years’ War to just three per cent in the 1720s.

LILLEY: Trump's trade war could cost Canada jobs for decades Back to video

In the process, a new industry was born, one that survives today. Port wine from Portugal, combined with wine from Spain, filled the gap. Today, Port is still closely associated with Britain, despite being made solely in Portugal’s Douro Valley.

It wasn’t sudden and it took time, but tariffs, a trade war and a shooting war all led to shifts in trading patterns that lasted decades.

Trade routes can change

I put this forward as Donald Trump is threatening to replace Canadian potash with supplies from Belarus. The immediate........

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