In Imperialism, Sovereignty, and the Making of International Law (2005), Anghie argues, among other things, that "colonialism was central to the constitution of international law and sovereignty doctrine".[11] In the course of making this argument, he develops his concept of the 'dynamic of difference' and argues that it is central to the civilizing mission of imperial projects. He writes:
[The civilizing mission] furthered itself by postulating an essential difference - what might be termed a 'cultural difference' - between Europeans and non-Europeans, the Spanish and the Indians, the civilized and the uncivilized. This basic distinction has been reproduced, in a supposedly non-imperial world, in the distinctions that play such a decisive role in contemporary international relations: the divisions between the developed and the developing, the pre-modern and the post-modern and now, once again, the civilized and the barbaric. My argument is that the 'civilizing mission', the maintenance of this dichotomy - variously understood in different phases of the history of international law - combined with the task of bridging this gap, provided international law with a dynamic that shaped the character of sovereignty - and more broadly, of international law and institutions.[12]
In other words, the 'dynamic of difference' posits a difference between two entities (e.g., two nations), declares the condition of one of these entities to be superior to that of the other, and then develops practices aimed at transforming the condition of this other to the condition of the superior entity - thereby collapsing the initially posited difference. For example, through this concept, development science, policy and discourse may be viewed as justified on the basis of a posited difference between 'developed' and 'developing' states along with the supposed superiority of the condition of being 'developed'. Although Anghie does not give it as an example of the dynamic of difference, the same can be said about state-building discourses, which posit a difference between 'successful' and 'failed' states in order to justify the science and practice of state-building, which supposedly rehabilitates the states labelled as 'failed'.
In October 2023, he signed a letter to Biden that Israel’s bombardment and intensifying blockade of Gaza has been condemned. This letter sign by legal scholars from some of the US’s most prestigious law faculties.
In this letter Israeli action calls ‘a moral catastrophe’.[13]