The Iran war is confronting the Middle East and the world with dramatic transformations. War realities are reshaping global supply chains and testing long-held alliances. They are also showing the limits of security and stability in the Gulf and the wider Middle East without a regional architecture, as well as the limits of military superiority in impacting desired political change. The Iran war is becoming one of the pivotal moments in international history that are measured not merely by the outcomes of military battles, but by the profound impact they leave upon the political and symbolic standing of major powers—as well as upon their self-perceptions and their capacity to shape the world according to their will. Today—as the war in Iran continues—the United States faces such a crux: Can it adapt to a world where it cannot rely on holding unipolar hegemony and where the limits of military superiority become ever clearer?

The challenge facing the United States today is twofold: first, adapting to the ongoing global transformations without the need for a shock, and second, recovering from the Iran war’s blow to its legitimacy as a global leader. Its capacity to address both challenges is bound to be tested systematically in the next few years.

If it hopes to adapt, the United States can draw lessons from past moments where world powers were tested. Prominent among these moments is the Suez Crisis of 1956, which stands out as a decisive turning point in the trajectory of the British Empire. It exposed the limits of British imperial power and paved the way for its eventual decline, while simultaneously elevating the stature of Egyptian president Gamal Abdel Nasser as a symbol of national liberation across the Arab and developing worlds. In 1956, Nasser exercised a sovereign prerogative by nationalizing the Suez Canal—a decision that Britain and France perceived as a direct threat to their strategic and economic interests and, indeed, to their very status as imperial powers. The response was swift, taking the form of a military alliance comprising London, Paris, and Tel Aviv in an operation aimed at toppling the Egyptian regime, reasserting control over the canal, and reimposing the traditional norms of influence. Yet, despite the clear military superiority of the aggressors, the campaign ended in abject political failure under intense international pressure—particularly from the United States and the Soviet Union, both of whom viewed the escalation as a threat to the delicate equilibrium of the Cold War and to their individual, broader interests. This failure was not merely a tactical setback or a mishap in the conduct of a specific battle. Rather, it dealt a devastating blow to Britain’s image as a power capable of imposing its will, effectively signaling the beginning of the end of its role as a global leader.

The Suez moment is significant because it exposes the structural disconnect between military capability and political power. While Britain and France succeeded in achieving their military objectives—temporarily occupying Egyptian territory and inflicting material damage upon Egypt—they proved unable to translate these gains into sustainable political advantages, as the Egyptian regime was neither toppled nor surrendered its control over the canal. On the contrary, the operation resulted in their international isolation, the erosion of their moral and political legitimacy, and an accelerated dismantling of colonial empires. Conversely, Nasser skillfully leveraged the crisis to bolster both his domestic and international legitimacy, transforming a military assault into a political and symbolic asset catapulting Egypt to a beacon of anti-colonialism and himself to a national independence hero. This demonstrates that the outcomes of wars are not measured solely by events on the battlefield, but by how those events are politically interpreted at the negotiating table and diplomatically.

This lesson, which may appear self-evident today, was not always a factor in the calculations of major powers. Indeed, it has been repeatedly overlooked in subsequent conflicts; the war between the United States and Vietnam serves as a prime example. The United States entered the war possessing overwhelming superiority in military technology and destructive capability, yet it found itself unable to achieve a decisive victory. Vietnam, while materially weaker, possessed a superior capacity to harness other factors such as national legitimacy, local knowledge, and a leadership willing to endure prolonged human costs. Not only was the nature of the conflict unconventional, but the opposing side was not seeking a direct military triumph so much as banking on wearing down the will of subsequent American governments.

As human casualties mounted, domestic opposition within American society grew, and international support eroded, continuing the war became politically costly to such an extent that military victory was no longer feasible—or even meaningful. Thus, the war concluded with an American withdrawal that demonstrated a superpower’s inability to impose its will—even upon a far smaller nation—if the necessary political conditions were absent. Ultimately, the United States suffered defeat not at the hands of a military adversary but its own public’s opinion.

In Vietnam, American military power collided with three fundamental realities: first, that controlling territory does not equate to controlling society; second, that technological superiority cannot compensate for a lack of political and cultural understanding of the local context; and third, that time itself can be transformed into a weapon in the hands of the weaker party.

This scenario recurred—albeit in a different guise—during the 2003 Iraq War, when the United States succeeded in swiftly toppling Saddam Hussein’s regime in a military operation that, at first glance, appeared to be a textbook example of rapid, decisive action. However, this supposed military victory quickly morphed into the genesis of a complex and protracted crisis. The absence of postwar planning, the dissolution of state institutions, and the dismantling of the security apparatus collectively created a political and security vacuum. This vacuum was exploited by various forces—both internal and external—leading to an escalation of sectarian violence and terrorism, and resulting in a prolonged American military presence that failed to yield genuine stability.

In Iraq, it became abundantly clear that toppling a political regime does not automatically translate into building an alternative system, and that military force alone cannot reshape societies or impose models of governance from the outside. Furthermore, the experience underscored the critical importance of international legitimacy; the absence of a broad international consensus regarding the war undermined the United States’ ability to mobilize political and financial support, while simultaneously opening the door to widespread criticism of its policies. Thus, military superiority once again proved to be a tool of limited efficacy in the absence of a comprehensive political vision.

Turning to the present moment in 2026, we find that the conflict between the United States and Iran reintroduces these same dilemmas within an even more complex context. Despite the vast disparity in military capabilities, Iran is not confronting the United States through the framework of a direct, conventional war; rather, it relies on a hybrid mix of asymmetric tools—including regional networks populated by militarized militias and missile capabilities. This mode of conflict renders a decisive victory elusive, as it fragments the battlefields, prolongs the duration of hostilities, and drives up the political and economic costs of the war.

The regional and international environment surrounding the conflict further compounds its complexity. The absence of a broad international consensus regarding the war’s objectives and means, the divergence of stances among major powers, and the hesitation of certain traditional allies collectively constrain the United States’ ability to translate its military superiority into tangible political outcomes. Indeed, some of these very factors may operate in the opposite direction by undermining the legitimacy of military operations or diminishing their effectiveness.

In this context, the nature of the current international order plays a decisive role. The world is no longer bipolar, as it was during the Cold War era, nor is it unipolar, as it appeared to be in the 1990s; rather, it is trending toward a complex multipolarity in which the roles of major powers intersect with those of regional powers and nonstate actors. This multipolarity makes it difficult for any single power—no matter how formidable—to unilaterally impose its will, thereby increasing the importance of building consensus and forging alliances.

Furthermore, the very nature of warfare has changed. Wars are no longer fought solely by regular armies on clearly defined fronts; instead, they encompass multiple dimensions—economic, informational, cyber, and political. Weaker adversaries have become more adept at exploiting these dimensions to offset their military inferiority, making it difficult for major powers to achieve decisive military and political superiority. Within this framework, war transforms into a process of managing a protracted, asymmetrical, and complex conflict, rather than a battle resolved by a clear-cut outcome.

Nor can one overlook the role of domestic public opinion in democratic nations, which has emerged as a decisive factor in determining the trajectory of wars. The experiences in Vietnam—and subsequently Iraq—demonstrated that public support is not a static constant; rather, it is influenced by the evolving dynamics of the conflict as well as its human and economic costs. In today’s world—where information spreads rapidly and societies possess an ever-growing capacity for self-expression and organization—sustaining such support has become increasingly challenging, thereby imposing additional constraints on decisionmakers.

Thus, it becomes evident that military power—despite its undeniable importance—is no longer sufficient to achieve decisive outcomes in international conflicts, even when the confrontation involves a major power facing a significantly smaller state. Achieving a decisive outcome now demands a complex blend of tools: effective diplomacy, international legitimacy, stable alliances, the capacity for postconflict management, and a deep understanding of local contexts. Without these elements, military victories devolve into fleeting achievements—temporary gains that quickly erode under the weight of political complexities.

Revisiting the comparison between 1956 and 2026, the parallels lie not merely in the limits of military force, but in the broader challenge of translating power into sustainable political influence. Through the Suez Canal crisis, Britain discovered—albeit belatedly—that the era of empires imposing their will through force had passed, and that international legitimacy had become an indispensable component. Today, the United States faces a similar challenge—albeit within a different context—namely, the imperative to adapt to a world in which unilateral hegemony is no longer attainable through traditional means.

Nevertheless, the differences remain significant. The United States still possesses substantial military, economic, and technological superiority, alongside an extensive network of alliances and adaptable institutions. Moreover, the challenges it confronts are not the result of a single, decisive defeat, but rather the cumulative effects of a series of crises and experiences that have exposed the limits of unipolar hegemony and military power.

This suggests that what we are witnessing today may not constitute a “Suez moment” of crisis, but rather presents, in a similar fashion to the British in the Suez crisis in 1956, a window into the reality of the contemporary power landscape. This window elucidates a gradual trajectory that is reshaping the U.S. position in the international order and perceptions of America’s foreign policy—perhaps forever changed by the Iran war’s blow to U.S. legitimacy as a global leader.

Along this trajectory, another factor of equal importance comes to the fore: how the United States perceives its own global role. It is within the dynamic interplay between the logic of hegemony and the logic of partnership, and between reliance on hard power versus investment in soft power, that Washington’s capacity to adapt to the ongoing transformations will ultimately be determined. Experiences ranging from Vietnam to Iraq and Iran suggest that an overreliance on military instruments—unaccompanied by adequate political and diplomatic engagement—leads to limited or counterproductive outcomes.

Moreover, managing conflicts in today’s world requires acknowledging the multiplicity of actors and the interplay of interests. In the Middle East, for instance, no external power can achieve sustainable stability without taking the national security, economic, and political interests of regional powers into account and without working to develop multilateral conflict resolution and peacemaking tools. This brings us back to the central idea that military victory—even if achieved—cannot substitute for the necessity of political settlements.

Ultimately, a comparison of Suez, Vietnam, Iraq, and Iran reveals a recurring pattern: a great power possessing formidable military capabilities, yet facing increasing limitations in its ability to translate these instruments into sustainable political outcomes. This pattern does not signify the end of power, but rather its redefinition. For in today’s world, power is no longer measured solely by the capacity to win wars, but by the capacity to prevent them, to manage them should they occur, and to build a more stable regional and international order in their wake.

The Suez crisis of 1956 taught us that disregarding international legitimacy and political balance undermines influence. The lessons of Vietnam, Iraq, and Iran add that underestimating the complexities of societies and local conflicts—along with excessively relying on military force—can transform superiority into a liability. Military power expressed without legitimacy ultimately leads to other forms of power losing all value, creating a political failure.

In light of these lessons, the United States today appears called upon, more than ever before, to rethink its instruments and strategies; not because it has lost its power, but because the very nature of the world in which it exercises that power has fundamentally changed.

In this sense, the moment of 2026 may not be a moment of decline, but it is certainly a moment of testing. It is a test of the United States’ capacity to learn from history—to transition from a logic of military resolution to one of conflict management, and from the imposition of its will to the building of consensus. While Britain required the shock of Suez to recognize the limits of its power, the question facing the United States today is whether it can internalize that same lesson without the need for a similar shock. If the United States fails to learn, the accumulation of experience will lead—slowly but surely—to a reshaping of its role as a global leader.

An early version of this piece appeared in Al-Ahram Weekly, and parts are reused here with permission.