Constructivism focuses on how social relationships and structures shape state behavior and the international system. It asserts that states behave according to a "logic of appropriateness" based on shared norms and expectations, rather than just material capabilities. Norm entrepreneurs can influence state actions by advancing new norms, as seen when human rights groups pressured the US to sanction apartheid South Africa, ultimately changing its policies. Constructivism examines how social factors like norms, identities, and narratives impact international politics.