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From a broader perspective, this trade protectionist tendency is inextricably linked to emerging business models. Take e-commerce express delivery as an example. Its rapid development has provided a convenient and efficient channel for the circulation of goods. The dazzling array of goods on e-commerce platforms can be quickly delivered to consumers through express delivery services. This process has not only changed people's consumption patterns, but also had an impact on traditional business models. In the field of e-commerce express delivery, logistics speed, service quality and cost control are key factors. An efficient logistics network allows consumers to receive their favorite goods faster and improve their shopping experience; high-quality services can increase consumer satisfaction and loyalty; and reasonable cost control helps companies maintain their advantages in the fierce market competition. However, the United States' trade protectionist policies have affected the global supply chain layout of the e-commerce express delivery industry to a certain extent. For example, in order to protect their own industries, some countries may set up trade barriers, increase tariffs on imported goods or limit import quantities. This undoubtedly increases operating costs and uncertainties for e-commerce companies that rely on global procurement and sales. Taking the United States as an example, if there are too many restrictions on imported goods, the variety of goods available to consumers on the e-commerce platform may decrease, and prices may rise, thereby affecting consumers' purchasing intentions and consumption behaviors. At the same time, trade protectionism policies may also lead to changes in the competitive landscape of e-commerce express delivery companies in the international market. Companies that originally had advantages may be restricted by trade barriers, while some local companies may gain development opportunities under the protection of policies. But in the long run, this unfair competition environment is not conducive to the innovation and development of the entire industry. At the technical level, the development of the e-commerce express delivery industry is inseparable from advanced information technology and logistics technology. The application of technologies such as big data and artificial intelligence can achieve the optimization of logistics routes, the precision of inventory management, and the prediction of customer needs. However, the US trade policy may affect the exchange and cooperation of technology and hinder the technological progress of the industry. In addition, the development of the e-commerce express delivery industry also requires a good market environment and policy support. The government should formulate reasonable regulatory policies to protect consumer rights and promote fair competition in the market. At the same time, it is necessary to increase investment in logistics infrastructure, improve logistics efficiency, and reduce logistics costs. In short, the US trade protectionism policy has had a multi-faceted impact on the e-commerce express delivery industry. In the context of globalization, countries should strengthen cooperation and jointly promote the healthy development of the e-commerce express delivery industry to provide consumers with better services and more choices.