One should also compare the Quebec model of Interculturalism, vis a vis the Toronto-Vancouver-Calgary model of Canadian Multiculturalism. One seems to be succeeding while the other features people leaving.
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I wonder if you have in mind the terrorist group -inspired by Al-Qaeda-, the famous "Toronto 18"  or if you were also thinking of the terrorist attack  of the Air India flight 182 in British-Columbia which killed 177 passagers??