Canada signed two major free trade agreements in a single day, striking deals with Ecuador and the United Arab Emirates as Prime Minister Mark Carney's government accelerates efforts to diversify away from its overwhelming reliance on the U.S. market. The diplomatic push comes amid a deepening tariff war that now includes 50% duties on $20 billion worth of Canadian exports.

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• 50% U.S. tariffs on Canadian goods: Set to take effect August 19, targeting dairy,...