Foreign countries are angry about Trump’s tariff taxes and are considering selling their U.S. Treasury bonds and/or not renewing them.  China apparently is planning to sell their $761 billion.  Canada holds $328 billion.  Additionally, the U.S. Treasury will have to be selling additional bonds to cover our rising national debt.
There is a direct correlation between rising interest rates on Treasurys and the increased rates for mortgages, car loans, credit cards, and corporate bonds.  Compounding this rise is the diminution of the value of the dollar, down a huge eight percent just since Trump’s inauguration day.  The U.S. currency has traditionally been stipulated as payment in most trading agreements. This will be no longer be the case.  America’s creditworthiness reputation will be damaged, and result in an increase in cost of our national debt.
Trump’s fickle implementation of tariffs is leading to lasting irreversible harm to the U.S. reputation, economy, and ethical standards.  If even possible, it will take considerable time to reestablish our good reputation, long after Trump has left the stage.  
According to a recent article in The New York Times, autocratic leaders are influenced by warnings from advisers, allies and powerful constituencies like business owners.  In the case of Trump, however, all of his appointees have sworn fealty to him prior to appointment, or he has threatened them, or has showered them with special favorable treatment.
It is doubtful if Canada will ever again trust the ability of U.S. voters to elect knowledgeable and ethically principled leaders.  In the meantime, Canada has engaged in a long-term contract to supply China with oil.  They are starting to use their new oil pipeline to the West Coast for heavy crude oil that previously was sent to the U.S.  Their contract states that they get paid when the oil is received at their Vancouver port, providing China with an option to sell Canadian oil to other Asian countries.
It will be impossible for the U.S. to replace the diverted oil with domestic oil reserves because U.S. domestically drilled oil is a lighter grade which cannot be processed by refineries that are designed to handle heavy crude. Therefore, the U.S. will have to import heavy crude oil to meet the requirements of the refineries left idle as result of Canada selling its oil to China.  It will be extremely expensive to retrofit our existing refineries and might take years to accomplish. 
Another problem Trump must consider is a possible cut off from Canada’s low-cost hydro-generated electricity imported to serve one and half million U.S. homes in three states: Minnesota, Michigan, and New York. At a minimum, Canada will impose a tariff tax of 25 percent to reflect U.S. tariff taxes on Canada. If Canada decides to punish the U.S., (remember Trump’s threating annexation of Canada as the 51st America state, doesn’t help) it can redirect the low-cost electricity to their own uses in Canada and subject Americans to an indeterminable long-lasting blackout of homes, stores, offices, factories, hospitals, churches plus curtailing transportation of electric vehicles and use of electricity operating gas pumps, until the U.S. can establish a new source of electricity for these states.  (Remember Trump’s “we don’t need them.”)
Canada controls our access to Alaska over land, water and air space.  They might establish tolls or barriers despite any previous contracts to the contrary.  Alaska is dependent on imports, especially by trucking across Canada.
Already, many Canadians have stopped using American goods and services creating substantial losses for the American suppliers, especially for the tourist businesses.  Furthermore, Canada has been an ally in U. S. military operations.  We have lost their support, adding to our growing isolationism.
As the new prime minister of Canada has accurately stated, “We will get stronger as they get weaker.”
Gerry Snyder
Ely