President Trump escalated his fight with Canada on Tuesday, threatening to double tariffs on steel and aluminum imports and pressing to turn one of America’s closest traditional allies into the 51st state. After several tense hours, both sides backed down, at least for now.

It was the latest in a week of chaotic trade moves, in which the president startled investors and businesses that depend on trade and clashed with some of the country’s closest trading partners.

In a post on his social media platform Tuesday morning, Mr. Trump wrote that Canadian steel and aluminum would face a 50 percent tariff, double what he plans to charge on metals from other countries beginning Wednesday. He said the levies were in response to an additional charge that Ontario had placed on electricity coming into the United States, which was in turn a response to tariffs Mr. Trump imposed on Canada last week.

By Tuesday

Keep reading this article on The New York Times Energy & Environment.