Canadian leaders have pledged retaliatory efforts against tariffs imposed by President Trump, such as blocking electricity exports.

The American president recently started fixating on the line separating the United States and Canada. It’s worth asking why.

But Mr. Trump’s criticisms have upended the business-as-usual atmosphere at the border. Map along the Canada-United States border highlighting Coutts, Canada and Sweet Grass, United states.

President Trump says Canada ought to be the 51st state – and between that and his tariffs, U.S.-Canadian relations continue a downturn that began with the Covid-19 crisis.