Yes, Canada has two borders with the U.S.: in the south, between us and the "lower 48", and in the north, between us and Alaska. The latter border loops up and over that big sound whose name escapes me right now, creating the Alaska Panhandle and the semi-isolation of Skagway.

Canada has a long tradition of pretending these borders are mere formalities until something happens to get us all riled up. During the 19th century, these events tended to originate in American spasms of territorial expansion -- check the Aroostook War, some aspects of the War of 1812, the Oregon Crisis and the Alaska Boundary Dispute, for example.

We're much politer now, or perhaps more keenly aware of which side of our bread is buttered, and consequently limit our fussing to the field of trade regulation. Softwood shingles, anyone?