Canadian Prime Minister Mark Carney has announced retaliatory tariffs that will “match Washington’s new tariffs dollar for dollar” after days of intense negotiations between the United States and Canada broke down.The tit-for-tat response came after US President Donald Trump imposed a 50 percent levy on $20bn of Canadian goods, or 5.5 percent of its exports, disrupting the long history of stable relations between the two North American neighbours.Recommended Stories list of 4 itemslist 1 of 4How will Trump’s tariffs affect Canada’s economy?list 2 of 4Carney: Canada will enact retaliatory US tariffs starting September 8list 3 of 4Canada to match US tariffs “dollar for dollar,” PM Carney sayslist 4 of 4Canada to hit US with retaliatory tariffs as trade war escalatesend of listTrump first imposed tariffs on key imports from Canada early in his second term last year. The two countries have scuffled since with Trump periodically making new tariff threats.So what prompted this latest escalation, and how will it impact the two Western economies?How did talks break down?In Ottawa on Saturday, Carney said the talks with the US broke down late the day before after Trump set conditions that were ultimately unacceptable.“In recent days, the United States proposed new terms that were uneconomic, unfair and undermined the net benefits for Canada, and called into question the reliability of any deal,” Carney said, adding that these demands included curtailing Canada’s ability to forge new trade deals, in violation of its sovereignty.“We’re the partner of choice in many respects for countries around the world, and the Americans wanted to restrict that. They had language that wanted to restrict that. Unacceptable.”He added that US negotiators also made unacceptable “threats” to the French language and “Quebec culture”, referring to the French-speaking province in eastern Canada.In a speech later in the day, Carney suggested that last-minute changes at the bargaining table had prompted him to recall his negotiators from Washington, DC, to Ottawa.“In short, they asked too much, and they offered too little.”Trump responded to Carney’s announcement by writing on his platform Truth Social: “Canada wants the benefits of being a State, without being one!!!” Trump has previously issued threats to annex Canada and make it the 51st US state.The US president claimed Canada has also charged US farmers “massive amounts” of tariffs for years, adding, “No more!!!”What Canadian products will be affected by the US tariffs?The list of goods from Canada that will be affected is long, ranging from whisky to goose-down jackets and ice hockey equipment.The 50 percent levy on roughly $20bn of Canadian goods covers more than 500 product categories, including: