What are the core assumptions of realism and why has it been so influential in the study of international relations

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Hassan Al-Hassani - Ldybha

What are the core assumptions of realism and why has it been so influential in the study of international relations?

It is not difficult to understand why realists were so influential in the nineteenth and early twentieth century. As a theory of international relations it was dominant throughout both centuries as it emphasised that the state was the sovereign body and during this period this was the case. However, the end of the Cold War marked a turning point for the majority of international relations theories, none were able to predict those series of events, certainly not realism and as such it began to lose credibility. Now instead of asking is realism influential we must ask if it is infact still relevant given the current political circumstance, states are beginning to form political and economic unions with a higher authority causing serious doubts to be cast over a realist account of the 21
st Century.

Realism argues that on the international stage the main actor is the state and its distinguishing trait is supreme sovereignty. Weber defines the state as “the monopoly of the legitimate use of physical force within a given territory” (Weber 1995). Within this territory realists believe that the state has absolute authority as it is the sovereign drawing upon the Hobbesian view that citizens trade liberty for a guarantee of security. According to realists competition does not occur on a domestic level, it is present only in the international sphere where states will compete with each other for “security, markets and influence” in a state of anarchy (Baylis and Smith 2006: 172)  

Morgenthau wrote “All politics is a struggle for power that is inseparable from social life itself” (Morgenthau 1948a 17-18). Here he illustrates the realist view that states operate in an international system of anarchy, that is to say there is no overarching sovereign in the international sphere and as such states are the supreme sovereign units.  According to realists states have two objectives, first they must organise power domestically and then strive to accumulate power internationally, by power realists are referring to “Mans control over the minds and actions of other men” (Morgenthau 1955: 26). For realists the international arena is a constant struggle for power between states, and although conflict is always a possibility, realists believe that this struggle helps sustain an international balance of power. However, divisions have formed over this belief. Defensive realists argue that the principal interest of a state should be its security; as such states only have to seek a requisite amount of power required for their survival. Waltz argues that states are defensive actors who will not attempt to gain more power if it threatens their security to do so. If a state is driven by a basic quest for power it will not stop increasing military capabilities and strengthening armed forces. This differs to the offensive realist perspective which argues that the ultimate goal of the international system is for all states to achieve a hegemonic position. As such states will always desire more power and are therefore willing to increase this power even at the risk of their own security, Baylis argues that states do so with the aim of “improving their position in the international system” (Baylis and Smith 2006: 174)


The realist emphasis on power is furthered with their views of self-preservation and self-defence. As realists believe that states are not under the rule of any overarching global authority, they must attempt to survive in a system of international anarchy causing them to become self-reliant. As Waltz argued, “Beyond the survival motive, the aims of states may be endlessly varied” (Waltz 1979: 91) simply, the foremost concern for states should be survival as there is no higher body to ensure it. The international environment severely penalizes states if they fail to protect their vital interests or if they pursue objectives beyond their means; states actions, according to realists, are therefore driven by one purpose, national interests because in the international system there is no other body to protect these interests. According to Waltz, this issue can be solved through self help as “self help is necessarily the principle of action” (Waltz 1979:111). However, this self-help system leads states into a spiral of insecurity – the ‘Security dilemma’ which occurs when the military capacity of a state creates “an irresolvable uncertainty in the mind of another as to whether those preparations are for defensive purposes or whether they are for offensive purposes” (Wheeler and Booth 1992: 30)  As states are reliant on self-help they seek to increase military capabilities to protect themselves from other actors. However, it is unclear to other actors as to whether their neighbors’ intentions are defensive (to enhance their security) or offensive (to exert their power upon other states). As such one states power causes another state to become insecure. As states are uncertain they begin to match the military power of their neighbours in order to protect themselves. This was seen in modern Korea. As North Korea has continually enhanced their nuclear capabilities it has led to South Korea strengthening theirs out of caution. Both counties wish to develop an effective self defence policy and do so by making themselves appear increasing powerful to other actors.

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 However, according to realists there are other means of achieving security. Santos argues actors can either emulate the methods of the most powerful states or they can innovate (Santos 1996: 204). But many realists agree with Waltz and argue “survival depends upon a states material capacity and alliances with other states” (Waltz 1979: 103-4). The development of the North Atlantic Trade Organisation in 1949 illustrates this argument. Created to counter communism, the organisation established a system of collective member defence against any non-member actor who attacked a member. Those in the North Atlantic Area realised that it was in their ...

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