Liberalism originated from Enlightenment thinkers like Locke, Smith, and Kant who focused on individual freedom and reason. Liberals view humans as generally reasonable and peaceful in the state of nature, leading them to a more optimistic view of cooperation. Liberalism suggests global cooperation is possible and challenges the realist view that world politics is inherently competitive and violent. Liberals argue that states will pursue mutual gains through cooperation using strategies like tit-for-tat. They believe cooperation can emerge under anarchy through economic interdependence, international institutions, and democracy promoting shared interests between states.