Sphere of Influence

Definition

A sphere of influence is a geographic region in which a great power exercises predominant political, economic, or military influence, effectively limiting the sovereignty of states within that sphere. The concept is rooted in colonial and Cold War era politics, when the US, Soviet Union, and European powers carved out zones of control. Modern spheres of influence operate through economic dependency, military basing agreements, security alliances, and political patronage rather than formal colonial control. Russia's assertion of a sphere of influence over post-Soviet states, China's growing influence in the South China Sea and through the Belt and Road Initiative, and US influence in the Western Hemisphere are contemporary examples. The concept challenges the liberal international order's principle of sovereign equality.