Final answer:
A state aligns with other states to form a balance of power and create a predictable international environment. Military alliances and collective security measures like NATO are examples of states seeking mutual support and deterring aggression.
Step-by-step explanation:
A state that forms an alliance with a collection of states to balance out the power of an opposing coalition is actively seeking to create a balance of power. This strategy is often used to control the anarchy inherent in the international system and to create a predictable environment that favors the interests of the participating states. States may seek to even out power disparities through military alliances, such as security pacts, or through economic and political means, aiming to form a web of allies for support in times of need.
A security pact is an example of states coming together to provide mutual military support and deter aggression. The concept of collective security is another manifestation of this strategy, where states form alliances to strengthen each member's security, making it difficult for one state to dominate or act unilaterally. Institutionalism, as per liberalist views, points to international institutions that enable such alliances and collective security measures.