Open this photo in gallery:Prime Minister Mark Carney in Ottawa on Aug. 22.Chris Tanouye/ReutersThere have been tariffs and countertariffs, negotiations and breakdowns, “Lake America” and an invitation to kiss the Premier of Ontario’s posterior. Since Prime Minister Mark Carney walked away from an unpalatable trade agreement with the United States, the two countries are again engaged in a tense standoff, and there is little indication about what will happen next.In the interim, there have been calls for Canada to take a more aggressive stand, including export levies on natural resources such as oil and potash. Ontario Premier Doug Ford has…