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WASHINGTON, D.C. — Barbecues, fireworks, and parades — all signs of July. For towns and cities on both sides of the border, these celebrations have long focused on their own national holiday, while nodding to the other’s as a way of drawing crowds. This year, Canada Day and Fourth of July events are still happening, but trade tensions sparked by President Donald Trump’s tariffs and “51st state” rhetoric have created a more wary political and economic climate, with far less Canadian travel to the United States. “We used to do a tremendous amount of active marketing in Toronto,” said...