An air quality map shows conditions improving in the U.S. on Friday as smoke from the Canadian wildfires subsides.

Canada’s ‘Strong Border Act’ is a recent chapter in the history of co-operation and coercion by the United States, but for Canadians, it could be even more troubling than Donald Trump’s travel bans.

Port Huron, a southeast Michigan city across the St. Clair River from Canada, sits at the edge of Lake Huron. Here's what to ...

Multiple states bordering Canada could feel the greatest impact of a 35 percent tariff on Canadian products starting August 1.

President Trump has repeatedly described the U.S.-Canada border as an "artificially drawn line." But experts say just because it was man-made doesn't mean it's not legitimate.

President Trump prioritizes northern border security as Canada's lax immigration controls allow criminal networks to exploit the US-Canada border for drug trafficking.

The U.S.-Canada land border is the longest in the world, though none of it has a physical wall like at the U.S.-Mexico border.

A wealthy widow built a library and opera house on the border between Quebec and Vermont, a symbol of binational friendship. Now U.S. officials are restricting access to Canadians.

A present-day map displayed in the Mendenhall Glacier pavilion shows the zigzag border which runs from summit-to-summit as agreed in the original 1825 treaty between Russia and Great Britain.

The U.S.-Canada border, as seen in this satellite map, mostly runs along the 49th parallel — and wasn't chosen at random. Planet Observer / Universal Images Group via Getty When President Trump ...

President Trump has repeatedly described the U.S.-Canada border as an "artificially drawn line." But experts say just because it was man-made doesn't mean it's not legitimate.