You're kidding right. Canada? Hahahaha!
The American border guards stationed along the Canadian border could conquer all of Canada in 2 days, drunk. Canada's 'modern' military of 2,300 bolt-action-rifle-wielding-mounties riding on moose-back couldn't even invade America if the ENTIRE American military was off 'liberating' China since every citizen of USA has 4 machine-guns, 60 land-mines and 2 RPGs in their basement.
Not to mention that since Canada spends 90% of its budget funding free Medicare, it can't afford to buy weapons, so it outfits its military by dredging the great lakes for guns discarded by American criminals.
Also, 90% of the (totally unarmed) Canadian population lives within 100 miles of the American border. So, that's about 1 day's work for the American tanks to have conquered all of Canada that MATTERS.
The idea would have been better if RUSSIA was conducting the cyber-attacks and then the Russian army just walked through Canada, unopposed, to invade America. That would be believable! (and was actually feared would happen during the cold war, which is why America forced Canada to upgrade from muskets to bolt-action rifles in 1975)
Canada is lucky America TOLERATES its existence. The minute Canada stops supplying oil, minerals, and lumber to America, Suddenly WMD's will be found in Canada and the next week Americans will be able to drive to Alaska without needing a passport.
Oh yeah, can't play the game because it SAYS I don't have the latest version of Flash, but I do.