The theory most focused on the idea that states define their interests in terms of power is

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Realism is the theory that states focus on the acquisition and preservation of power as their primary interest. Realists argue that states operate in an anarchical international system and therefore must rely on their own capabilities (i.e. military, economic, diplomatic) to survive and advance their interests. This focus on power and self-help distinguishes realism from other international relations theories such as liberalism, which emphasizes cooperation and interdependence among states.

The Theory Most Focused on the Idea That States Define