Given what we have seen American citizens tolerate in the past, I expect public opinion not only to support such an invasion, but for Americans to enthusiastica

Given what we have seen American citizens tolerate in the past, I expect public opinion not only to support such an invasion, but for Americans to enthusiastically participate. In fact, some redneck militia trying to invade Canada is a common trope in US entertainment (from South Park over to The West Wing, even a whole movie exists), implying that it would be pretty easy. It's played for laughs, but it adds to the desensitisation of the public opinion about such an endeavour. Consent is manufactured.