But as of now, the only thing we rely on you for is oil.
Note quite. The US Eastern seaboard and great lakes area relies heavily on electricity generated up here. Then there's forestry. US forests have made a slight recovery (10% growth rate), and lumber from us in bulk is such a better deal than using your own or importing form over seas, that if you did it has been projected to cost the average new home owner up to as much as 25% more for a new home. The US buys, last time I checked 90%+ of their uranium form us, and have for almost 50 years. Also it's far from unlikely we wouldn't find other buyers, just not ones who will buy in such bulk....just as the US could certainly buy elsewhere but everything would then have the 'imported from across that huge ocean' tax that in some cases would make it impossible. As far as Alaska and the oil goes, well the US is already drilling up there and whatever else they find will not recover what Canada sells them (but then why would we refuse? Who else are we going to sell it to?)
All patriotic posturing aside, the economic relationship between the US and Canada is not well described as 'good business between neighbors', but imo, is better characterized as conjoined twins who share each others resources to such extreme extent that it would be hard to predict the out come of a separation. Certainly both, on a grass-roots, you-me-and-the-guy-next-to-you, would suffer immensely.
90% of what Canada gets from the US and what the US gets from Canada would cost detrimentally more if the conditions changed severely.
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