Why states act like aggressive power maximizers in an anarchic world

Cultures · Published 3 October 2026 Swipe more like this →

In short: In the high-stakes arena of global politics, why do nations constantly seek to expand their reach? John Mearsheimer argues that survival isn't just a goal; it is a driver of aggression. His theory of offensive realism suggests that because there is no global authority, states are trapped in a rational cycle of power accumulation.

John J. Mearsheimer, a prominent American scholar at the University of Chicago, developed the theory of 'offensive realism.' While his predecessor Kenneth Waltz argued that the lack of a central authority (anarchy) leads states to favor the status quo and seek defensive security, Mearsheimer posits a more aggressive reality. He argues that because states can never fully ascertain the intentions of others, it is rational for them to preemptively increase their military might and adopt assertive positions to ensure survival.

Mearsheimer’s framework rests on five core assumptions: the international system is anarchic, all states possess some military capability, states cannot know each other's true intentions, states value survival above all else, and states are rational actors. These conditions create strong incentives for nations to behave aggressively toward one another. Unlike classical realists who blame human nature or leaders' personalities for conflict, Mearsheimer locates the cause in the very structure of international relations.

This perspective has shaped his critiques of modern foreign policy. He advocates for 'global balancing'—where a superpower like the United States intervenes only to counter regional threats—rather than seeking 'global hegemony.' Consequently, he was highly critical of the 2003–11 Iraq War and U.S. efforts to police the world, while viewing participation in World War II as appropriate because Nazi Germany and imperial Japan sought regional dominance. His work continues to influence debates on China's rise, nuclear proliferation, and the limitations of liberal international order.

Mearsheimer’s career reflects a transition from military service to academic theory. After graduating from West Point in 1970 and serving five years as an Air Force captain, he pursued advanced degrees at Southern California University and Cornell. His influential works, including 'The Tragedy of Great Power Politics' (2001) and 'The Great Delusion' (2018), continue to provide a sobering, structurally-driven lens on why great powers often find themselves on a collision course.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Why the world remains an anarchy without a global 9-1-1
• Why does the world's most secure nation keep failing at its own foreign policy?
• Why the absence of a world government makes global conflict an inevitable structural reality.
• Why the father of political realism believed nations must always seek maximum power
• Why states expand: the relentless pursuit of security and power
• From London rock bands to the heights of Hollywood's most iconic film scores
• Did a single general choose the site of the Battle of Gettysburg?
• The legendary hitman John Wick has a confirmed kill count of 439 enemies
• Was the famous psychic medium actually just a master of television editing?
• How two women built a business empire without the right to vote
• From childhood poverty to the frontlines of cryptocurrency litigation and Senate races
• Johor: The Southernmost Jewel of the Malay Peninsula With a Complex Imperial Past

More in Festivals & celebrations · More in Cultures · Latest · A–Z · All topics