Heyyy, war... Canada has never been in a war with the US, well that's not totally true, when we were still a British colony we did kick your ass in the War of 1812, since then we have always been friends
And just to be precise, the British Empire Loyalists, those Americans and their descendants who came to British North America cuz they didn't agree with the American War for Independence, did help us kick their former countrymen back below the 49th parallel. At least that's what I remember from high school history.
Scott.