[openasocket]

That's true, a US-Mexican war in that era wasn't nearly as far-fetched as an invasion of Canada. A better example would have been War Plan Gold, which involved war with France

[saalweachter]

While it had been over a century since our last attempt to invade Canada by then, there has always been a certain flavor of American in love with the idea of continuing the doctrine of Manifest Destiny until the entire continent has been conquered.

(Those snooty Australians lording their continent over us, we'll show them.)