A battle brewing between two neighbors could up-end the tourism industry in the U.S.

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

New Canadian Prime Minister Mark Carney has arrived in Paris to meet with French President Emmanuel Macron, seeking support from one of Canada’s oldest allies as U.S. President Donald Trump continues to attack Canada’s sovereignty and economy

Mark Carney was sworn in Friday as Canada's 24th prime minister, delivering remarks on the new government and trade saying "negativity won't win a trade war."

Former central banker Mark Carney has been sworn in as Canada’s new prime minister

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

President Trump reiterates his desire for Canada to become the 51st state amid the ongoing trade battle, saying he’s not “going to bend” on tariffs.

United States trade partners, including the European Union, responded after President Donald Trump’s 25% tariffs on steel and aluminum imports went into effect Wednesday. Trump said he’s "not happy."

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.

Canadian Chamber of Commerce president Candace Laing says “markets are incredibly frustrated with uncertainty” created by tariffs.

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

Canada has entered a new era of leadership, with Liberal Party leader Mark Carney, a banker and investor, elected as Liberal Party leader to succeed Justin Trudeau.

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

Canada’s Liberal Party is electing a replacement for Prime Minister Justin Trudeau on Sunday. Leading contenders are former head banker Mark Carney and former Deputy Prime Minister Chrystia Freeland.

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

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

Canadian police say a dozen people were injured in a shooting at a pub in eastern Toronto

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."

President Donald Trump's broad tariffs on imported goods from Mexico and Canada took effect on Tuesday.

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

President Donald Trump is moving ahead with 25% tariffs for Canada and Mexico, plus a newly increased 20% tariff on China. Economists say they will mean higher prices for consumers.

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.

Connor McDavid scored an overtime winner to lift Team Canada over Team USA in the inaugural 4 Nations Face Off final, 3-2.

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

The U.S. has paused for one month the implementation of tariffs on Canada and Mexico following President Donald Trump's conversations with each nation's leaders on Monday.

The U.S. has paused the implementation of tariffs for a month in both Canada and Mexico following conversations on Monday with President Donald Trump, according to each country's leader.

President Trump ordered tariffs on imports from America's biggest trading partners, claiming he's doing it to stop the flow of drugs and undocumented immigrants into the U.S.

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.

On “This Week,” ABC News senior White House correspondent Selina Wang reports on the new tariffs announced by President Donald Trump Saturday.?

ABC News Correspondents Selina Wang and Alexis Christoforous provide the latest updates regarding President Donald Trump's increased tax of goods imported from Mexico, Canada and China.

Canadian Prime Minister Justin Trudeau responded to President Donald Trump’s tariffs Saturday evening by announcing the country will implement 25% tariffs on $155 billion of U.S. goods.

Consumers brace for rising prices as President Donald Trump imposes tariffs on Canada, Mexico and China.?

Economist Kimberly Clausing joined ABC News Live to talk about the possible effects for Americans of Trump’s newly imposed tariffs.

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

Trudeau announced he intends to resign as Liberal Party leader and prime minister once a new party leader is determined.

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 surprise meeting took place amid reports that Canada may be considering retaliatory tariffs against the United States.

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.

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.

One of the unions issued a strike notice just hours after the freight trains resumed operations following a brief lockout. A work stoppage could disrupt supply chains.

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