贸易战全面升级！特朗普一天内宣布对多国及铜业50%关税

Group 1 - The U.S. has announced significant trade policy adjustments, including high tariffs on key raw materials like copper, indicating a comprehensive escalation of protectionist policies [1][2][4] - A trade agreement with South Korea includes a 15% tariff on imports, while South Korea commits to invest $350 billion in U.S. projects and purchase $100 billion in LNG [2] - Tariffs on Brazilian products have been raised to 50%, with certain products like wood pulp and oil exempted from the increase [2] Group 2 - A 50% tariff on imported semi-finished copper products and copper-intensive derivatives will take effect on August 1, leading to a significant drop in international copper prices, with a historic single-day decline of 17.7% [3][4] - The U.S. will suspend the tax exemption for low-value goods, meaning imports valued at or below $800 will be subject to all applicable tariffs, aimed at tightening trade policies [4] - The measures are justified under the guise of "national security" according to the U.S. Trade Expansion Act of 1962, raising concerns about potential retaliatory actions from trade partners and impacts on global supply chains [4]