在美国最后一刻贸易谈判失败后，美国已对价值200亿美元的加拿大商品征收50%的关税。加拿大总理Mark Carney誓言将采取同等力度的关税进行报复，以保护国内产业。此次升级引发了对涉及美国、加拿大和墨西哥的北美贸易协定未来的担忧。 AI
排序理由 该集群报道了两大国之间一项重大的监管行动（关税），影响了贸易。[lever_c_demoted from significant: ic=1 ai=0.1]
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The United States imposed 50 per cent tariffs on US$20 billion worth of Canadian products early on Saturday and Canada immediately said it would retaliate, after last-ditch negotiations failed to resolve the latest strain in already tense relations between the historic allies. US…