以贸易封锁与技术封锁实现制造业回流，美国能如愿么？

Group 1 - The manufacturing activity in the U.S. has been continuously shrinking from March to July 2025, but the claim of a "complete recession" in U.S. manufacturing is not entirely objective [1] - U.S. manufacturing now accounts for less than half of its peak GDP share, with steel production relying on support from Japanese companies [1] - The U.S. is using tariffs as leverage, and its manufacturing sector is gradually and steadily returning, supported by Europe and Japan [1] Group 2 - The U.S. aims to achieve manufacturing return through trade and technology blockades in a dynamically evolving multilateral trade system [2] - The monopolistic technological advantages of the U.S. are diminishing due to the effects of technology diffusion [2] - The strategy of temporary (possibly long-term) trade and technology blockades is intended to facilitate the return of manufacturing [2]