The military base I have most often heard associated with plans to invade Canada is not K. I. Sawyer, but Ft. Drum, which is in upstate New York, not far from Watertown.
There was lots of bluster about annexation (voluntary or otherwise) from various U.S. politicians in the 19th and very early 20th centuries. Benjamin Franklin Butler, the 1884 presidential nominee for the Greenback party, made annexation, by force if necessary, a point in his campaign. The vast majority of forced annexation talk was just talk, intended only to garner votes.
I knew about the Alaska boundary dispute, but I didn’t add it to the list because I didn’t believe there was any real likelihood of it leading to war. Great Britain had no intention of going to war with the U.S. over this issue, and Canada couldn’t go it alone. The tribunal that settled the boundary consisted to three members from the U.S., two from Canada, and one from Great Britain. The British delegate voted with the Americans, and so the final boundary determination was much to Canada’s detriment.
The Pig War? I don’t remember hearing about that one before. Thanks for the information.