Wang Jinguo Cao Jialu

Abstract：After the 1941 Pearl Harbor attack，the United States began to break away from the tradition of isolationism，change its attitude of not participating in world affairs，and actively participate in the construction of hegemony and international discourse power．Up to now，American hegemony has not been left behind．The construction of an international system is a key factor for U．S．hegemony．Since President Trump was elected，the United States has successively withdrawn from the Paris climate agreement and the Trans-Pacific Partnership Agreement．Its “withdrawal from diplomacy” has aroused widespread concerns and discussions around the world．On the surface，this kind of withdrawal by the United States from the international system will affect the global leadership of the United States to a certain extent，and its cost is also very high．However，through in-depth analysis，we find that，in fact，for the United States，this is actually a means of institutional checks and balances，that is，a strategy of reshaping the international system．A series of “exit diplomacy” acts by Trump is a way to maintain American hegemony at low cost by reshaping the international system．Trump makes full use of withdrawal or threats to withdraw from the international system to expand American power and influence，rather than simply considering economic factors．After dynamically weighing the relationship between cost and benefit，Trump adopted appropriate opposition to the international system，which not only reduced U．S．costs，but also maintained the hegemony of the United States．