Which school of foreign policy is concerned with protecting national interests through a strong military as a deterrent and the belief that nations always act in their own self-interest?

Question

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Realism is the school of foreign policy that argues that the primary goal of a nation is to protect its own interests through the use of military power as a deterrent. Realists believe that nations always act in their own self-interest and that the international system is anarchic, meaning that there is no overarching authority that can regulate the behavior of individual states. Therefore, realism advocates for a strong military and a willingness to use force to protect national interests.

Which School of Foreign Policy Is Concerned with Protecting National