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 ...

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.

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

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.