دانشگاه رازی مطالعات اقتصاد سیاسی بین الملل 2383-3602 9 1 2026 05 22 From Decline to Reconfiguration: Traditional and Emerging Challenges to U.S. Hegemony از افول تا بازآرایی: چالش‏‌های سنتی و نوظهور هژمونی آمریکا 25 44 4307 10.22126/ipes.2026.12779.1773 FA حمید احمدی نژاد استادیار گروه علوم سیاسی و روابط بین‏ الملل، دانشکده ادبیات و علوم انسانی، دانشگاه لرستان، خرم‌آباد، ایران. 0000-0001-5859-0590 حسین چهره آزاد دانش‏آموخته کارشناسی ارشد روابط بین ‏الملل، دانشکده حقوق و علوم سیاسی، دانشگاه خوارزمی، تهران، ایران. Journal Article 2025 09 13 The hegemony of the United States, as the cornerstone of the post-Cold War international order, has rested upon economic-military superiority, international regime-building, and ideological authority. However, recent developments in the international system have revealed signs of erosion in this status. Drawing on Charles Doran’s power cycle theory and a descriptive-explanatory method based on library-based data, this study poses the following question: What traditional and emerging challenges does U.S. hegemony face, and how do these factors affect the transition of the international order? This study demonstrates that the convergence of relative economic decline, political-military challenges, and the weakening of ideological influence—as traditional factors—alongside novel challenges such as paramilitary actors, the erosion of ironclad deterrence, ineffectiveness against low-cost military technologies, and the decline of narrative-building, has accelerated the erosion of U.S. hegemony. This paves the way for the transition into a multipolar order in which China (in the economic arena), Russia (in the geopolitical domain), and middle powers (in asymmetric theaters of engagement) will play key roles as influential actors in shaping global politics. <strong> Introduction</strong> Following the end of World War II, and especially after the collapse of the Soviet Union, the United States was recognized as the undisputed hegemon of the international order. The three pillars of this hegemony included economic-military superiority, regime-building capacity, and ideological legitimacy. However, regional and global developments—from the chaotic withdrawal from Afghanistan to the Ukraine war and the intensifying rivalry with China—have shown that these pillars no longer possess their former robustness. In another dimension, emerging challenges such as paramilitary actors, the erosion of ironclad deterrence, low-cost military technologies, and ultimately the decline of narrative-building have, over the past two decades, subjected U.S. hegemony to multiple signs of erosion. By posing the question—what traditional and emerging challenges does U.S. hegemony face, and how do these factors affect the transition of the international order? —This article seeks to provide a comprehensive picture of the shifting balance and transformation of the international order. <strong> Theoretical Framework</strong> The present study draws on Charles Doran’s power cycle theory—a framework that explains the rise, stabilization, decline, and replacement of hegemons as a cyclical process within the international system. According to this theory, hegemonic decline is not merely the result of the emergence of rivals but rather the consequence of internal erosion of legitimacy and ineffectiveness in reproducing order. This analytical framework helps to understand the current decline of the United States in conjunction with traditional and emerging challenges. <strong> Method</strong> This research is analytical in nature and descriptive in methodology. Data collection follows a library-documentary approach, encompassing various sources including books, academic articles, official documents, and authoritative information databases. Furthermore, the collected data are supported by statistics and documented evidence to enhance the scientific credibility of the findings. <strong> Findings and Discussion</strong> The findings indicate that the decline of the United States is multidimensional: Traditional Indicators: Relative economic decline vis-à-vis China, political-military failures in Iraq, Afghanistan, and Ukraine, and the crisis of soft power and liberal legitimacy. These factors indicate that the United States can no longer impose the existing order solely based on the norms, values, and narratives of the liberal order. Emerging Indicators: Inability to confront non-state actors (e.g., Houthis, Hamas, and Hezbollah), the erosion of ironclad deterrence against direct attacks on vital bases, the challenge posed by low-cost technologies such as drones and short-range missiles, and the decline of global narrative-building and consensus-shaping. These components are particularly evident in the Gaza war, the campaign against Iran, and failed sanctions against Russia.      The combination of these traditional and new factors suggests that the United States has shifted from a "dominant hegemon" to a "preeminent but constrained power." This transition simultaneously provides the groundwork for the enhanced agency of emerging powers such as China and Russia, as well as middle actors. From a theoretical perspective, this simultaneity of crises signals entry into the "delegitimization" stage of the power cycle—a stage that provides greater room for maneuver for emerging powers and reduces Washington's monopoly over setting the global agenda. Given the current trajectory, the future resembles not the persistence of unipolarity but rather a historical transition toward multipolar orders characterized by the dispersion of power centers and increased relative instability. <strong> Conclusion</strong> This research concludes that the decline of U.S. hegemony is not a transient phenomenon but rather a sign of structural transformation in the international order. This decline does not mean the immediate collapse of U.S. power; the country still possesses extensive financial, technological, and military capacities. However, it will no longer be able to unilaterally determine global rules. Hence, the future of global politics will be shaped by multipolarism, great-power competition, and the increasing agency of middle and non-traditional actors. On this path, China (with economic power), Russia (with geopolitical influence), and middle powers (with asymmetric tactics) will have a greater share in setting the global agenda. The choice facing the United States lies between two options: either accommodate the reality of multipolarization and design a strategy based on cooperation and burden-sharing in security, or, by insisting on previous patterns, accelerate the erosion of its legitimacy and the entry into the fourth stage of the power cycle—namely, the creation of a new order هژمونی ایالات متحده، به‌عنوان ستون نظم جهانی پساجنگ سرد، بر پایه برتری اقتصادی-نظامی، رژیم‌سازی بین‌المللی و اقتدار ایدئولوژیک استوار بوده است. با این حال، تحولات اخیر نظام بین‌الملل، نشانه‌های فرسایش این جایگاه را آشکار ساخته‌اند. پژوهش حاضر، با بهره‌گیری از نظریه چرخه قدرت چارلز دوران و روش توصیفی-تبیینی مبتنی بر داده‌های کتابخانه‌ای، این پرسش را مطرح می‏کند که: هژمونی آمریکا در معرض چه چالش‏های سنتی و نوظهوری است و این عوامل چه تأثیری بر گذار نظم بین‏الملل دارند؟ نوشتار پیش رو نشان می‏دهد که پیوند افول نسبی اقتصادی، چالش‏های سیاسی-نظامی و تضعیف نفوذ ایدئولوژیک به‏منزله عوامل سنتی با چالش‏های جدیدی ازجمله بازیگران شبه‏نظامی، تضعیف بازدارندگی آهنین، ناکارآمدی در برابر فناوری‏های ارزان نظامی و افول روایت‏سازی، فرسایش هژمونی آمریکا را تسریع کرده است. این امر زمینه‏ساز تسهیل ورود به نظمی چندقطبی است که در آن، چین در عرصه اقتصادی، روسیه در حوزه ژئوپلیتیکی و قدرت‌های میانی در عرصه‏های بازی نامتقارن، به‏عنوان کنش‎گران تأثیرگذار نقش‌های کلیدی در شکل‌دهی به سیاست جهانی ایفا خواهند کرد. https://ipes.razi.ac.ir/article_4307_0c0e691c7e878b52d5ed5224a094ba60.pdf