特朗普失算了，他猛然发现：美国最大的王牌，对中国已不起作用

Core Viewpoint - The article discusses the escalating tensions between the U.S. and Canada regarding trade agreements with China, highlighting the ineffectiveness of U.S. tariff threats and the resilience of Canada and China in the face of such pressures [1][3][5]. Group 1: U.S. Trade Policy and Reactions - Trump criticized the China-Canada trade agreement as the worst ever, threatening to impose 100% tariffs on all Canadian goods if they continue cooperation with China [1]. - U.S. Treasury Secretary Mnuchin suggested that China would face additional tariffs if they violated the agreement framework, indicating a continuation of extreme pressure tactics [1]. - The U.S. response included attempts to sow discord within Canada, such as encouraging Alberta to hold an independence referendum, reflecting a strategy of division [5]. Group 2: Canada and China's Stance - Canada, under Prime Minister Carney, signed a trade agreement with China that significantly reduced tariffs on electric vehicles from 100% to 6.1% and established an import quota of 49,000 vehicles annually [3]. - Canada responded to U.S. threats with a call for citizens to support local products, demonstrating a unified domestic front against U.S. pressure [5]. - China maintained a calm and composed response, indicating a strategic understanding of the global landscape and reinforcing its trade relationships with other nations [7]. Group 3: Implications for U.S. Global Standing - The article notes that the U.S. is becoming increasingly isolated on the international stage, with European countries considering selling off $3.6 trillion in U.S. debt, which constitutes 40% of foreign-held U.S. debt [7]. - The U.S. reliance on tariffs as a tool for negotiation is portrayed as ineffective, with data showing a continuous decline in manufacturing jobs despite tariff implementation [5]. - The article suggests that the U.S. attempts to exert pressure through tariffs are failing, as other countries pursue independent trade relationships, reflecting a shift towards a multipolar world [7].