[QUOTE=Attack from the 3rd dimension]
I think it is derived primarily from a lack of knowledge about non-US countries, Canada in particular, as well as the general assumption that non-Americans have the same view of the US as Americans have. In general, Canadians have a very different view of the US than the US has of itself.
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Well, of course Canadians’ view of the US is different than the US’s view of itself. To Americans, the US is their country, while to Canadians it is a friendly country, sure, but that doesn’t look for their interests first (and neither should it). It doesn’t change the fact that Canada and the US are quite similar countries. I’m sure both countries’ cultures are a bit different, but since there is quite a lot of cultural variation, both in Canada and in the US, I’m not sure how you’d even describe this.
As I’ve said, these certainly do exist, but I’m curious to know what they are, according to you.
Well, look at my location. 
Now that’s a bit dramatic, don’t you think?
[QUOTE=Leaffan]
Hell yeah we’d feel bad if Quebec City was attacked! Last time I looked it was still part of **MY **Canada. (And probably the most beautiful city in North America.)
[/QUOTE]
Oh, of course, and I’d feel bad if any city in the world was attacked by terrorists, really. I’ll admit, though, that I wouldn’t feel as much “immediacy” if it was a city far from here, and rather different in culture. My post was actually more of a reponse to levdrakon’s comment that Canadian provinces are, to him, more states, especially with the other posters mentioning that they have family or friends in Montreal. Would it feel the same way to him (and others) if it’s a part of Canada that doesn’t speak the same language and with which he doesn’t have as much family ties? And how about Mexico, which as_u_wish already brought up? This is not a trap or anything, I can understand why it would feel less immediate (and I expect it, since it’d be the same for me).
This said, if we’re talking about an attack by international terrorists, an attack on any Canadian city is equally a threat to all Canadian citizens, and to the citizens of many other countries as well. So I guess it really depends on what kind of attack we’re talking about.