Exemplary situation of the realpolitik, where one power must confront another not because the attack but to avoid that equalize or surpass in commercial, military, cultural capacity, the Politologist Graham Tillett Allison coined the term based on the theory of the history (R) Greek Thucydides, which explained the Peloponnese war as the Spartan attempt to limit Athenian growth, which would affect the balance of power in the region.