What defines a great power, and why is the label so notoriously difficult to pin?

History · Published 29 September 2026 Swipe more like this →

In short: A great power is a sovereign state capable of exerting influence on a global scale, yet no consensus exists on what makes one. From military might to economic reach, the criteria remain subjective, shifting from the post-Napoleonic Concert of Europe to today's complex, multi-polar landscape of global institutions.

The term 'great power' emerged in the diplomatic lexicon during the post-Napoleonic era, formalised by the 1814 Treaty of Chaumont and the subsequent Congress of Vienna. Initially, it described a specific group—Austria, France, Prussia, Russia, and Great Britain—that claimed the right to enforce postwar treaties and maintain the 'Concert of Europe'. This status was not merely about raw strength; it was an institutionalised position within a web of rights and obligations, where these states acted as the primary arbiters of international peace.

Defining these powers has always been contentious. Early realists, such as A. J. P. Taylor, argued that the ultimate test was military strength in war. Others, like Kenneth Waltz, proposed a broader set of criteria including population, resource endowment, and political stability. Modern critics, such as Phillips O'Brien, contend that the label is dated and inconsistently applied. O'Brien suggests replacing it with 'full-spectrum power', which accounts for the interplay of economic resources, technological capabilities, and the domestic political systems that can either expand or restrain a nation's capacity to project influence.

The international balance of power has never been static. By 1900, the original Congress powers were joined by Italy, Japan, and the United States, reflecting the rise of new industrialised nations. Following the devastation of the World Wars, the structure of global authority shifted again, leading to the creation of the United Nations Security Council. Today, the status remains a mix of empirical observation and diplomatic recognition, with scholars like Peng Yuan noting that even established powers can experience significant slippage in their political, economic, and social foundations.

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