Donald Trump's negotiators handed Canada a four-page demand for "preferential operational access" to Halifax, Montreal, Vancouver, and Prince Rupert — the four ports that handle 92% of Canadian seaborne trade. Twelve hours later, Mark Carney walked into a press room and answered in nine words. What happened next: 47 container ships rerouted, $390 billion in supply-chain disruption, six Republican governors broke publicly with the White House, and the European Union announced expanded Canadian maritime cooperation. This is the full story — the demand, the response, and the cascade.

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