Would the US ever attack Canada to take control of their oil supply?

With the Administration’s decision to say no to the Keystone pipeline, Canada is now trying to market their oil – of which they have a lot – to China and the Far East. That’s their right and it makes some business sense to Canada. If they can’t sell to the US, then why not sell it elsewhere?

The US may not like that, long term. Canada’s oil is close by and safe in a political sense, not subject to the whims of the Sheiks and Emirs.

Can you see a possibility – if Harper and other Canadians start playing like they are Saudi Arabia – of the US attacking Canada to take control of the oil fields?

(If the US ever did, Canada would fold in a matter of days – their military, while well trained – is miniscule.)