Must be all the US money that we use to buy oil from Canada, our number 1 supplier.
Canada’s top corporate tax rate is 19.5%. The US is 39% (and going higher under Obama).
I wouldn't have believed that stat had I not verified it at the DOE site.
However, as oil demand is correlated almost perfectly with economic activity, I assure you, we're not buying as much oil as we used to, or as we might.
or US companies which have their factories over there.