When, by the way, did the US invade Canada? There were invasions in 1775, 1812 and 1813, when that region was British North America and the US was at war with Britain. Of course, the final (1813) invasion only happened after the British army and local militia had attacked south and taken Detroit. There was also the Sein Finn "invasion" in, I think, 1866, but that was quickly put down by US troops. Oh yeah, there was also the "pig war" on San Juan Island in 1859...does it count if nobody gets hurt except the pig?

Did "Canada," as a nation, exist before the British North America Act of 1867. Or was it the British acceptance of Canada as a soverign state in 1931? Or later still? Sorry, but I do not believe that the United States has ever invaded the nation of Canada.