The Beginning of a Post-Hegemonic Era: A New Normal for International Relations

Published in UDN
(Taiwan) on 4 June 2025
by Chuei-Ling Shin (link to originallink to original)
Translated from by Jennifer Sampson. Edited by Patricia Simoni.
Following the return of Donald Trump to the White House, the international order has moved into the early stages of a post-hegemonic era. This shows not only the changes in the distribution of international power, but also indicates the deep, fundamental shift in the international order. The U.S. is no longer taking the initiative to be responsible for systematic global governance. However, within the loosening system, deconstruction of values and changing methods of interaction, the U.S. still profoundly leads in defining and shaping this new era through the way in which it has retreated, the actions from its policies and its strategic attitudes.

The characteristics of the international order at the beginning of a post-hegemonic era are as follows:

First, unipolar dominance switches to multipolar co-construction: The unipolar system in which the U.S. has been the sole leader since the Cold War is no longer sustainable. Trump and his administration clearly deny that the U.S. should take the role as leader of the world order. In an interview soon after he took office, Secretary of State Marco Rubio clearly stated that the unipolar world was a historical exception, not a norm that should be continued. Trump’s “Make America Great Again” emphasizes America First and ferrets out the interests of allies who are weighing down the U.S. This changing role of the U.S. promotes a multipolar structure of power centers, such as the U.S., China and Russia. Although the tussle between the U.S. and China is ongoing and the leadership power has yet to be divided, the era of one leader is over.

Second, confrontation and opposition become opposition and the beginning of coexistence: Structural contradictions among countries’ institutional values, strategic interests and political cognition cannot easily be erased. However, unlike the approaches of resistance and rejection used in the past few years, figuring out how to coexist and build a “shock-absorbent peace” and preserving functional cooperation and risk management will be the primary logic used in interactions. A bit of this can be seen from America’s approach. On the one hand, Trump is hitting China with trade and technology wars. On the other, he has kept open the window for economic exchange and military communication. Rubio stressed that U.S. diplomacy can cooperate with those with whom it has “no shared value.” This oppositional yet not entirely confrontational mode of interaction makes up the most prominent diplomatic view in an era of early post-hegemony.

Third, the international system becomes diverse and complex: The liberal international order is no longer the only platform for cooperation. During Trump’s time in office, the U.S. has chosen to withdraw from, marginalize or ignore various international institutions, causing power to be redistributed among them. Subsequently, there will be at least three trends: First, large powers will lead together and amend existing institutions (such as the World Trade Organization and World Health Organization). Second, regionalism will strengthen (such as integration of the EU, East Asia and ASEAN countries). Third, multilateral groups will rise and link together institutionally (such as the G20 and BRICS nations). Although independent, these institutional platforms have overlapping functions, indicating a trend toward diversity in international institutions and modular governance.

In the face of the abovementioned changes to the structural order, the way countries interact is also adjusting. In addition to traditional alliances and institutional cooperation, increasingly more countries will interact and cooperate under the precondition of differing values and oppositional positions. This kind of “strategic limited cooperation” model stresses strategic dealings, with particular emphasis on functional cooperation and risk management. Its key characteristics can be represented as follows:

• Cooperation exists but is shallow and nonbinding. Although both sides oppose each other on high-level political issues, they may still maintain cooperation in the areas of economics and trade, energy and technology.

• The structure for interaction is built in a modular fashion. The topics on which countries cooperate are independent of each other. They are not deeply integrated on an institutional level, nor are they necessarily tied to high-level political interaction.

• The focus is on pragmatism, flexibility and risk. The point of international interaction is to solve problems, satisfy mutual needs and minimize risk. It is not to build common values or long-term trust.

The real world in the early stages of a post-hegemonic era is one in which interaction must continue but systems are not integrated, values are not cohesive and power is not concentrated. International policies no longer center around system integration and stable alliances. Instead, they must be focused on risk management, flexible issues and diverse platforms. Post-hegemony does not equal a loss of order; rather, it will be a new international order that moves from unipolar to multipolar. In this kind of world, the key to determining if a country can remain operational will be whether it can nimbly pivot its thoughts, cognition and operational methods.

The author is a professor in the Department of Political Economy at Sun Yat-sen University.


辛翠玲/後霸權時代初期:國際關係新常態

隨著川普重返白宮,國際秩序進一步轉進後霸權時代的初期階段。此不僅顯示國際權力分布的變化,更預示國際秩序的深層轉型。美國雖不再主動承擔全球治理的制度責任,但無論是制度鬆動、價值解構到互動方式的改變,美國的退場方式、其政策作為與戰略態度,仍然深刻主導新時代的定義與樣貌。

後霸權時代初期的國際秩序有以下特徵:

第一,從單極主導走向多極共構:後冷戰以來美國為全球唯一領導者的單極體系已無法持續。川普與其政府明確否定「美國應主導國際秩序」的角色定位。國務卿魯比歐在其甫上任的專訪中明白表示,單極世界本就是歷史上的例外,而非應被延續的常態。川普的讓美國再次偉大強調美國優先、揪出拖累美國的盟友利益。美國的角色轉變,推動美、中、俄等多個權力中心的多極格局。儘管美中角力未歇、主導力尚未均分,但主導者唯一的時代已經結束。

第二,從衝突對立進入對立與磨合並存:各國間制度價值、戰略利益與政治認知等結構性矛盾本即不易抹滅。然而,不同於過去數年以對抗與否定為主的處理方式,如何在敵意與矛盾中共存、建立「避戰式的和平」,維持功能性合作與風險控管將是主要互動邏輯。此可由美國作法略窺一二。川普一方面對中國大打關稅戰與科技戰,另一方面卻保留經濟往來與軍事溝通窗口;魯比歐則強調,美國外交可以與「無共享價值」的對象進行合作。這種既對立又不全面對抗的互動模式,構成了後霸權時代初期最顯著的外交風景。

第三,國際制度轉向多元與複合:自由國際秩序(LIO)不再是唯一的合作平台。美國在川普任內選擇退出、邊緣化或冷處理多個國際制度,致使國際制度權力空間重新分布,後續至少有三種趨勢:一是大國共同主導修正既有制度(如WTO、WHO等);二是區域主義強化(如歐盟、東亞與東協整合等);三是多邊集團的興起與制度拼接(如G20、金磚集團)。這些制度平台各自為政、功能交錯重疊,顯示國際制度多元與治理模組化的走向。

面對上述秩序結構的轉變,國與國之間的互動方式也隨之調整中。在傳統的同盟模式與制度性合作之外,將可見越來越多國家間,在價值分歧與立場對立的前提下互動合作。此類「戰略性有限合作」模式強調策略性往來、側重功能性合作與風險控管。其關鍵特點可模擬如下:

•合作存在但不深度連結。雙方即使在高階政治議題上對立,仍可能在經貿、能源、科技等領域維持合作。

•互動架構為模組式拼接。合作議題各自獨立,不建構深度制度整合,也不必然與高階政治互動綁定。

•務實、彈性與風險。國際互動的重點在於解決問題、滿足共同需求、風險最小化,而非共同價值建構或長期信任堆疊。

後霸權時代的初期階段是一個制度不整合、價值不聚合、權力不集中,但互動仍需持續的現實世界。國際政策不再以制度接軌與同盟穩定為中心,而以風險管理、議題靈活與平台多元為要。後霸權不等於無秩序,而是由單極走向多軌的國際新秩序。在這樣的世界裡,思維認知與操作方式能否靈活轉換,也將是國家得以維持行動力的關鍵。


(作者為中山大學政治經濟學系教授)

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