A tentative trade deal between Canada and the U.S. collapsed less than an hour before a late Friday deadline, triggering the imposition of President Donald Trump’s latest round of 50-per cent-tariffs on US$28-billion of Canadian exports, a vow of “dollar-for-dollar” retaliation by Prime Minister Mark Carney and an abrupt escalation in the continental trade war.

Mr. Trump and Mr. Carney had reached a deal earlier in the week, at which point the President put his new tariffs on hold until 12:01 a.m. Saturday while the two sides finalized details. But Mr. Carney said the U.S. tried to change the deal, so he broke off the talks and recalled Canadian negotiators on Friday.

In addition to trade matters, Mr. Greer said, the deal had been set to include national security, critical minerals and aerospace coordination provisions.

With the new tariffs imposed, The Globe wants to know how people are feeling about it and what your questions might be. What is exactly being tariffed? Which industries are going to face the brunt of the tariffs? What does this mean for U.S. and Canadian negotiations down the line?

Share your thoughts in the box below, or send us an email at audience@globeandmail.com.