Cities across the United States have seen up to a 65 percent decrease in Canadian tourism as the relationship between the two countries frayed amid President Donald Trump’s tariffs and talk of making Canada the 51st state, according to a new report from the University of Toronto, whose lead author told Newsweek that the decline spans more than just tourists and snowbirds.Washington and Ottawa have long been political allies on the global stage, but that relationship has been tested by Trump’s escalated rhetoric toward Canada. His tariffs and annexation threats caused many Canadians to avoid travel to the United States,…