# Balance of Power The **balance of power** is the central mechanism of [[Realism (International Relations)]] and the oldest idea in statecraft: in an anarchic system, states act to prevent any single power from becoming strong enough to dominate them all. When one state grows threatening, others **balance** against it — by building up their own arms (internal balancing) or by forming alliances (external balancing) — and the recurring result is a rough equilibrium that preserves the independence of the major players. ## Balancing vs. bandwagoning Realists distinguish two responses to a rising power. **Balancing** means joining the weaker side to check the stronger; **bandwagoning** means joining the stronger side to share the spoils or avoid being crushed. Classical balance-of-power theory holds that states usually balance, because allowing one power to dominate is the greater long-run danger. Stephen Walt refined the idea into **balance of threat**: states balance not against raw power alone but against the power they perceive as most threatening — a function of capability, proximity, and intentions. ## Structure and stability [[Kenneth Waltz]] gave the concept its modern structural form: balances of power **recur automatically** under anarchy, formed by states seeking security whether or not any statesman intends them, because the system selects against those who fail to balance. The number of great powers shapes how the balance behaves — Waltz argued **bipolarity** (two poles, as in the Cold War) is more stable than **multipolarity**, where shifting alignments and miscalculation are more likely. The **Concert of Europe** after 1815 and the US–Soviet standoff are the textbook cases. ## KB Significance Balance of power is the analytical core of the **realist case for restraint and against overextension**. Read through it, the contemporary world is a transition from the post-Cold-War "unipolar moment" of unchecked American primacy toward a more **multipolar** distribution in which China is the principal balancer — the situation the [[New Cold War]] frame names. The concept supplies the realist objection to NATO expansion (it provoked a predictable Russian balancing response) and the realist reading of the Ukraine war as great-power balancing rather than a simple morality play. It is the mechanism that connects [[Hans Morgenthau]]'s and [[Kenneth Waltz]]'s theory to the practice of [[Henry Kissinger]] and [[George Kennan]]. ## See Also - [[Realism (International Relations)]] — the paradigm this mechanism anchors. - [[Kenneth Waltz]] — the structural account of recurring balances. - [[New Cold War]] · [[International Relations]] · [[Heartland Theory]]