Balance of Power

Definition

The balance of power is a foundational concept in international relations describing a condition in which no single state or alliance is dominant, thereby preserving stability and deterring aggression. States achieve balance through internal means (building up military and economic capability) or external means (forming alliances and coalitions). When the balance is disrupted — through the rise of a revisionist power, collapse of an alliance, or technological breakthrough — it can lead to arms races, preventive wars, or systemic conflict. The Concert of Europe after 1815, Cold War bipolarity, and the emerging multipolar order of the 21st century all illustrate different configurations of the balance of power. The concept remains central to understanding great power competition.