Liberalism, also called pluralism, focuses on transnational relations between various actors including states, groups, and organizations. It emphasizes that issues like human rights, the environment, and the economy are as important as security. Liberals argue that states are not unitary actors and are influenced by domestic groups. They also argue that international cooperation is possible through international regimes and institutions. The liberal perspective has evolved from the Enlightenment ideas of individual rights and free trade to incorporate more modern concepts like complex interdependence and the roles of non-state actors like corporations.