But Trump announced time was up on March 3, and the tariffs went into effect overnight. Stock markets slipped, Canada ordered reciprocal tariffs, and by Thursday, Trump gave another 30-day extension to goods covered under the United States-Mexico-Canada Agreement, which applies to approximately 38% of imports from Canada.

Canada's Ontario province on Tuesday said it would suspend its 25% surcharge on electricity exports to the U.S. after agreeing to discuss a renewed trade agreement between the two North American countries.

The latest skirmish in U.S. President Donald Trump’s trade war is highlighting how the Canadian province of Ontario provides electricity to some American homes and businesses.