While many issues turned Canadians away from their prime minister, the high cost of groceries and homes has become a chief grievance.

But economic, political and technological changes have left Canada with few ways to handle trade restrictions now.

Justin Trudeau announced Monday that he was also stepping down as leader of Canada’s Liberal Party. He will remain in both roles until a replacement is chosen.

The Canadian prime minister, who said on Monday he would step down, has spent a quarter-century in the political spotlight.

Whoever replaces Mr. Trudeau as the leader of Canada’s Liberal Party will become the prime minister. Not long after they’ll face a general election, and the daunting challenge of keeping the job.

President-elect Donald J. Trump has threatened to impose tariffs on Canadian exports unless the country stops the flow of migrants and fentanyl to the U.S.

Ottawa says its focus on the Arctic comes after Russia’s invasion of Ukraine “has shaken the foundations” of international cooperation in the northern region.

© Renaud Philippe for The New York Times