National Post turned to several historical specialists to help explain what the 1908 treaty really is, what it means, and why Trump might be trying to weaponize it.

When U.S. President Donald Trump last spoke with Prime Minister Justin Trudeau, Trump pointed to a 1908 treaty as apparent ammunition to support his threats of a tariff war and his envisioned takeover of Canada.

https://nationalpost.com/news/canada/trump-waved-a-1908-treaty-as-ammo-in-his-disputes-with-canada-heres-what-you-need-to-know-about-it