The latest dispute adds new uncertainty to one of the world’s largest bilateral trading relationships. Trump has imposed a 35 percent tariff on some of Canada’s exports and has repeatedly suggested that Canada should be the 51st U.S. state. The latest dispute adds new uncertainty to one of the world’s largest bilateral trading relationships. Trump has imposed a 35 percent tariff on some of Canada’s exports and has repeatedly suggested that Canada should be the 51st U.S. state.