President Donald Trump continued to belittle Canada and threaten it with joining the United States as the economic war with the country continued.

Canadians in the U.S. for 30 days or longer will soon have to register their information with the U.S. government, according to a notice obtained by ABC News.

President Donald Trump on Tuesday backed down from a threat to impose an additional 25% in tariffs on Canadian steel and aluminum products.

Justin Trudeau, who was first elected prime minister in November 2015, announced on Jan. 6 his intention to resign as Liberal Party leader and prime minister.

Former central banker Mark Carney will become Canada’s next prime minister after he won Liberal Party leadership vote in a landslide

At least 12 people have been injured in a shooting at a pub in Toronto on Friday night, police said.

Canadian government officials say Canada’s initial retaliatory tariffs against the U.S. will remain in place for now despite President Donald Trump postponing 25% tariffs on many imports from Canada for a month

Ontario Premier Doug Ford said in an interview with ABC News Live that President Trump's tariffs against Canada are the "craziest idea someone could ever come up with."

The stock market tumbled Monday after President Donald Trump said tariffs would go into effect for Mexico, Canada and China as planned on Tuesday.

Britain’s King Charles III has given a warm welcome to Canadian Prime Minister Justin Trudeau as the two met for a private audience at the monarch’s royal residence Sandringham

The 25% tariff on most imported Canadian goods that President Donald Trump’s plans to impose Tuesday has touched off a range of emotions along the world’s longest international border

President Donald Trump's assertion that Canada should become the 51st state would likely lead to major Democratic electoral gains.

Canadian Prime Minister Justin Trudeau took a jab at President Trump after Canada's victory over the United States in an international hockey tournament.

Trump told reporters on Sunday he planned to speak with Canadian Prime Minister Justin Trudeau and Mexican President Claudia Sheinbaum on Monday.

The policy risks raising prices for essential products like gas and groceries.

In an interview on ABC News' "This Week," Canadian Ambassador to the U.S. Kirsten Hillman said Canadians are "perplexed" and "disappointed" by President Trump's tariffs.

The development comes a month after Canada's deputy prime minister, Chrystia Freeland, resigned suddenly from Trudeau's cabinet.

Cameron Dylan McDougall, 28, from Toronto, Canada, faces three counts of battery charges.

An Air Canada Express flight with 73 passengers aboard caught fire and had to be evacuated on a runway after landing in Halifax.

Authorities assigned to a region near the Canadian border in Washington found two backpacks left out in the woods containing an estimated $1.1 million of cocaine.

The meeting comes after Trump threatened sweeping 25% tariffs on goods from Mexico and Canada.

The school has become a central part of the lives of some who fled the war, even if they didn't initially intend it to become so.

Olivier Rioux holds the Guinness World Record for world's tallest male teenager.

Police in Canada took down an organized crime group believed to have produced tens of thousands of counterfeit cannabis-laced candy bars resembling named brand candy.

ABC News’ Mireya Villarreal met with the Department of Homeland Security to learn about the unique challenges teams face at the U.S. northern border.

Two major Canadian freight rail companies locked out thousands of workers on Thursday, shutting down cross-border shipping routes.

With wildfires burning across Canada, meteorologists said conditions are stacking up for a replay of last year's fire season when skies over New York City turned orange.

As the threat of an active wildfire season looms, there are steps individuals can take to mitigate the effects of wildfire smoke in their homes.

Former Canadian Prime Minister Brian Mulroney dies at 84, his daughter announced.

Delta flight 135 from Amsterdam to Detroit diverted to Goose Bay Airport in the Canadian province of Newfoundland and Labrador around 3:15 p.m. on Sunday, Dec. 10.

A Jewish school in Montreal was shot at early Sunday, the second time in under a week the school has been targeted with gunfire, officials said.

Hardeep Singh Nijjar was gunned down in June outside a temple in Surrey.

Canadian national security agencies are investigating "credible allegations" that "agents" of India were involved in the death of a Sikh leader in June, Trudeau said.

A CDC report published Thursday found that ER visits linked to asthma rose 82% in New York in June due to smoke from the Canadian wildfires.

The historic wildfire season plaguing Canada is expected to persist in the coming weeks or even worsen, driven by human-caused climate change.

Canadian Prime Minister Justin Trudeau is splitting up with his wife, Sophie, according to the leader's Instagram page.

Environmental experts say that the Candian and U.S. governments need to take a more proactive approach at combating the root causes of growing wildfires.

Canadian wildfire smoke is infiltrating the Midwest on Tuesday, and the air in Chicago has deteriorated to the Air Quality Index's "very unhealthy" category.

The smoke emissions from the wildfires burning in Canada has reached the highest-ever recorded in the country as plumes make their way across the Atlantic to Europe.