After trade talks collapsed, Mark Carney rallied the nation, Canadian businesses stood defiant, and President Trump moved to rename Lake Ontario.

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Detailed accounts of the final hours of the negotiations show that, while the United States offered Canada what it said was the best deal of any country, what Canada had to give up in exchange was seen as unthinkable.

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It was the final, major event planned for the nation’s 250th anniversary celebrations. The president took a lap.

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It was the final, major event planned for the nation’s 250th anniversary celebrations. The president took a lap.

© Alex Kent/The New York Times