World Government does not form part of Immanuel Kant's theory of 'perpetual peace'. The classic source of modern idealism in international relations theory is Immanuel Kant's 1795 essay ‘Perpetual Peace: A Philosophic Sketch’. According to him, the definitive articles for perpetual peace among states are: 1. ‘The Civil Constitution of Every State Should Be Republican’; 2. ‘The Law of Nations Shall be Founded on a Federation of Free States’; 3. ‘The Law of World Citizenship Shall Be Limited to Conditions of Universal Hospitality’.