Constructivism rejects a purely materialist view of international relations that focuses only on how the distribution of power shapes state behavior. Instead, constructivists argue that social factors like shared ideas, norms, and perceptions play an equally important role in shaping the international system and state interests and identities. The international system is not a fixed structure defined by material forces, but rather is socially constructed and can change as shared understandings between states change. For example, the end of the Cold War showed how states can redefine their interests and identities, transforming anarchy from a culture of "enemies" to "friends" through altered social interactions and understandings between them.