Historical context of idealism vs. realism

Various theories in international relations offer multiple models of explanation of relations between states, but most of them are based on the idea that states act in accordance with their national interests. In fact, in its essence state interests include the need to maintain security, sovereignty and the development of the economy. Classical realists such as: Thucydides, Machiavelli, Hobbes and Rousseau, see at the conflict as a natural state in international relations, not as a consequence that can be attributed to historical circumstances, wicked leaders, disturbed socio-political systems, or international disagreements. The basis of the theory of idealists such as: Grotius, Kant and Bentham are the denial of the right to war, because they consider it is possible to establish an authority capable of maintaining peace. From the perspective of the idealists, wars are caused by egoistic interests of state leaders at the expense of the interests of the citizens