Canadians’ desire to visit the U.S. is absolutely tanking, new data suggests. Why it matters: President Trump’s tariffs and insistence that Canada should become the 51st American state is fueling a remarkable rally-round-the-flag effect. Canadian patriotism is skyrocketing alongside disdain for all things American throughout the Great White North. Driving the news: Advance bookings for Canada-U.S. flights in April-September are down over 70%…