Final answer:
According to liberalism, cooperation between states is expected to occur under certain conditions. International institutions and alliances, such as NATO, play a role in promoting cooperation and ensuring collective security. Additionally, complex interdependence recognizes the importance of networks and collaboration among different actors in the international system.
Step-by-step explanation:
According to liberalism, cooperation between states is expected to occur under certain conditions. One branch of liberalism, institutionalism, emphasizes the importance of international institutions in promoting cooperation. States form alliances and create institutions to strengthen their security and ensure collective security. NATO is an example of an institution designed to promote collective security. Another aspect of liberalism is complex interdependence, which posits that networks of actors form to meet common goals. This view recognizes that different actors in the international system have competing interests, but they can still work together to achieve mutually beneficial outcomes.