中美关税战改变历史进程，美国战略大溃败已开始？

Group 1 - The core idea of the news is that the U.S. is shifting its strategic focus towards the Western Hemisphere, as indicated by the new National Security Strategy released by the Trump administration, which emphasizes an "America First" approach [1][3] - The document suggests that the era of the U.S. supporting the global order is over, likening it to the Greek myth of Atlas, and outlines plans for the establishment of a new U.S. Southern Command to replace existing commands [1][3] - The strategy reflects a broader trend of isolationism that has characterized Trump's presidency, with a more pronounced focus on domestic issues and regional affairs, potentially leading to a significant reduction in global engagement [3][6] Group 2 - The National Security Strategy criticizes European nations for their economic decline and suggests that they may face cultural shifts, which could alter their relationship with the U.S., indicating a potential low point in U.S.-Europe relations [5][6] - The U.S. has historically relied on its alliances, particularly with European countries, for military and economic support, and any deterioration in these relationships could hinder U.S. influence globally [5][6] - Trump's administration has also taken steps to strengthen economic ties with allies in Asia and the Gulf region, indicating a strategy to bolster domestic economic foundations while reassessing the U.S.-China power dynamic [6][8] Group 3 - The document's approach is seen as a modern variant of the Monroe Doctrine, aiming to assert U.S. dominance in the Western Hemisphere, but faces challenges in a globalized world where countries like China continue to engage with Latin America [8] - The U.S. strategy may not effectively prevent other nations from entering the Western Hemisphere market, as global trade dynamics evolve and countries seek competitive advantages [8] - The emphasis on isolationism raises questions about how the U.S. will maintain relationships with its allies, especially if it fails to meet their expectations, which could complicate future re-engagement efforts [8]