On August 6, 2020, the U.S. government announced a 10% tariff on aluminum that originates in Canada. The explanation for which was that aluminum is a security threat to the United States.Then, on August 8, 2020, the Canadian government announced they would be imposing a 10% tariff on certain products from the United States.
On September 15, 2020, the USTR released an announcement that imports of aluminum from Canada will not be subject to the 10% duty retroactive to September 1, 2020. This was motivated by a look at the real numbers and realizing that a tariff was perhaps not necessary.
Finally, on September 15, 2020, the Canadian government announced that they will withdraw the order to impose a 10% tariff on certain imports originating in the United States. This was motivated by the note above.
As noted in my original blog on this subject, the ones pay these tariffs are industry and consumers, so perhaps it is good both sides of the border.