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This chapter examines traditional theories in global politics. Although much of the explicit theorizing about international politics did not begin until the twentieth century, both liberalism and realism have drawn on long-standing ideas in the history of political thought to address basic problems of international order. So too has the English School which, while encompassing aspects of both liberalism and realism, has focused much more attention on the social character of international or global relations, elaborating in particular the notion of international society and its normative underpinnings. While most theorizing has been carried out largely, but not exclusively, on the basis of Western philosophical ideas, a new Chinese school of moral realism draws from ancient Chinese thought. Ultimately, both liberalism and realism have been modified over the years with competing strands developing within them, so neither can be taken as a single body of theory.


Helen Frowe

This chapter assesses war and intervention. Just war theorists share two beliefs: that wars can, at least in theory, sometimes be just, and that the fighting of war is governed by moral rules. Just war theory is usually divided into jus ad bellum, jus in bello, and jus post bellum. Jus ad bellum (justice prior to war) sets the conditions under which it is just to declare war. Jus in bello (justice during the war) sets the ‘rules of engagement’, governing the conduct of combatants during a conflict. Jus post bellum (justice after war) deals with topics like war reparations and punishment of aggression and had, until recently, received comparatively little attention in the just war literature. Meanwhile, pacifism and realism offer alternative approaches to the ethics of war.