On Wednesday, Prime Minister Mark Carney’s election campaign had brought him to the bridge between Windsor, Ontario, and Detroitfunkpg, over which $300 million worth of auto parts cross daily.

He unveiled a series of promises of programs for workers and auto-related industries that would be rolled out if President Trump imposed tariffs on products from the Canadian auto industry. Among them was a proposed fund of 2 billion Canadian dollars to reshape the industry for a future without the U.S. market.

The stakes are high. Cars and auto parts are the country’s second-biggest export by value and an employer, directly and indirectly, of about 500,000 people, accounting for 10 percent of manufacturing gross domestic product.

Known as a combative number cruncher and familiarly known as Jay, Mr. Goldin was first elected comptroller in 1973, the same year that Abraham D. Beame,ijogo who had been comptroller, was elected mayor. Mr. Beame was ousted after one term as the city neared insolvency, a key factor in Mr. Koch’s successful race to succeed him in 1977.

“It smelled of death,” recalled Dr. Auteri, now a biologist at Missouri State University.

But what Mr. Carney, nor anyone else in the Canadian government, knew at that time was that a few hours later the program would no longer be something for an emergency situation.

Mr. Trump, without first informing Canada, announced that he was imposing 25 percent tariffs effective April 2 on all imports of cars and auto parts, with no exemption for Canada.

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