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a short history of international law |
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2.e achievements of the inter-war period
Although the League failed as a protector against aggressors, it would be far wrong to suppose that the inter-war period was a sterile time in international law generally. Precisely the opposite was the case. It was a time of ferment, experiment, and excitement unprecedented in the history of the discipline. A World Court (known formally, if optimistically, as the Permanent Court of International Justice) was established as a standing body, with its seat at the Hague in the Netherlands. It did not have compulsory jurisdiction over all disputes. But it decided several dozen cases, building up, for the ,rst time, a substantial body of international judicial practice. ese cases were supplemented by a large number of claims commissions and arbitrations, whose outpourings gave international lawyers a volume of case law far richer than anything that had ever existed before.
e codi,cation of international law was one of the ambitious projects of the period. A conference was convened for that purpose by the League of Nations in 1930, but its fruits were decidedly modest (consisting mainly of clari,cations of various issues relating to nationality). But there were further initiatives by the American States in a variety of ,elds. ese included a convention on the rights and duties of States in 1933, which included what many lawyers regard as the canonical de,nition of a ‘State’ for legal purposes.23 e American States also concluded conventions on maritime neutrality, civil wars, asylum,
and extradition.
e inter-war period also witnessed the ,rst multilateral initiatives on human rights. A number of bilateral conventions for the protection of minorities were concluded between various newly created States and the League of Nations. In the event, these proved not to be very e#ective; but they set the stage for later e#orts to protect minority rights aBer 1945, as well as human rights generally. e principle of trusteeship of dependent territories was embodied in the mandates system, in which the ex-colonies of the defeated countries were to be administered by member States of the League. But this was to be a mission of stewardship—‘a sacred trust of civilization’—under the oversight of the League. Finally, the League performed heroic labours for the relief of refugees, in the face of very great obstacles—in the process virtually creating what would become one of the most important components of the law of human rights.
It was a period also of innovative thinking about international law. at the doctrinaire positivism of the nineteenth century was far from dead was made apparent by the World Court in 1927, when it rea<rmed the consensual basis of international law, in the famous (or infamous) Lotus case.24 But positivism also came under attack during this period, from several quarters. One set of attackers were the enthusiasts for collective security, as embodied in the League of Nations. e American scholar Quincy Wright was a notable exemplar. is group were sympathetic to the return of just-war ideas, with the Covenant’s restrictions on the resort to war and the provision for collective aid to victims of unlawful war. eir single most notable contention was that neutrality must now be regarded as obsolete.
Within the positivist camp itself, a sweeping revision of nineteenth-century thought was advanced by writers of the Vienna School, led by Hans Kelsen. ey discarded the State-centred, consent-based, pluralistic elements of nineteenth-century positivism, while
23 See Craven, below, Ch 8. |
24 ‘Lotus’, Judgment No 9, 1927, PCIJ, Ser A, No 10. |

24 stephen c neff
retaining its general scienti,c outlook. e Vienna School then reconceived international law—and indeed the whole of law—as a grand, rationalistic, normative system.25 e French lawyer Georges Scelle advanced a broadly similar vision, though with a sociological .avour, in contrast to the austere formalism of Kelsen.26 ere was even something of a revival of natural-law thought, most notably in the writing of the Austrian Alfred Verdross (who was something of a maverick member of the Vienna School).27
In short, the inter-war period did not bring an end to war or aggression. But it was the most vibrant and exciting era in the history of the discipline up to that time (and perhaps since).
B. after
In the immediate aBermath of the Second World War, international law entered upon a period of unprecedented con,dence and prestige, for which ‘euphoria’ might not be too strong a word. International lawyers even found themselves in the (unaccustomed) role of heroic crusaders, with the dramatic prosecutions of German and Japanese leaders for crimes under international law at Nuremberg and Tokyo in the late 1940s (see generally Taylor, 1992; and Cryer and Boister, 2008). At the same time, great plans for the future were being laid.
1. Building a new world
e founding of the United Nations in 1945, to replace the defunct League of Nations, was a critical step in the creation of a new world order. With the UN came a new World Court (the International Court of Justice, or ICJ), though still without compulsory jurisdiction over States. e heart of the organization was the Security Council, where (it was hoped) the victorious powers from the Second World War would continue their wartime alliance in perpetuity as a collective bulwark against future aggressors. (It may be noted that
‘United Nations’ had been the o<cial name for the wartime alliance.) |
e UN therefore |
marked something of a return to the old Concert of Europe approach. |
e special status |
of the ,ve major powers (the principal victors in the Second World War, of course) was formally re.ected in their possession of permanent seats on the Security Council, together with the power of veto over its decisions.
e UN Charter went further than the League Covenant in restricting violence. It did this by prohibiting not only war as such, but also ‘the use of force’ in general—thereby encompassing measures short of war, such as armed reprisals. An express exception was made for self-defence. Regarding action against aggressors, the UN was both bolder and more timid than the League had been. It was bolder in that the Charter provided not only for economic sanctions but also for armed action against aggressors. e UN Charter was more timid than the League, however, in that sanctions (whether economic or military) were not mandatory and automatic, as in the League Covenant. e Security Council— dominated by the major powers—was to decide on an ad hoc basis when, or whether, to
25On the Vienna School, see Kunz, 1934. For a clear and succinct account, see Friedmann, 1949, pp 105–117. See also Nijman, 2004, pp 149–192.
26See Scelle, 1932–34. See also Dupuy, 1990; Nijman, 2004, pp 192–242.
27See Verdross, 1927.

a short history of international law |
25 |
impose sanctions. e result was to make the UN a more overtly political body than the League had been.
Parallel to this security programme was another one for the promotion of global economic prosperity. e economic-integration e#ort of the nineteenth century, shattered by the Great War and by the Great Depression of the 1930s, was to be restructured and given institutional embodiments. e International Monetary Fund was founded to ensure currency stability, and the World Bank to protect and promote foreign investment and (in due course) economic development. Trade liberalization would be overseen by a body to be called the International Trade Organization (ITO).
In a host of other areas as well, the aBermath of World War II witnessed a huge increase in international cooperation. ere scarcely seemed any walk of life that was not being energetically ‘internationalized’ aBer 1945—from monetary policy to civil aviation, from human rights to environmental protection, from atomic energy to economic development, from deep sea-bed mining to the exploration of outer space, from democracy and governance to transnational crime-,ghting. e cumulative e#ect was to weld the States of the world in general—and international lawyers in particular—into a tighter global community than ever before. It is easy to understand that, amidst all this hubbub of activity, a certain triumphalist spirit could pervade the ranks of international lawyers.
e euphoric atmosphere proved, alas, to be very short-lived. Scarcely had the UN begun to function than it became paralysed by Cold-War rivalry between the major power blocs—with the notable exception of the action in Korea in 1950–53 (only made possible by an ill-advised Soviet boycott of the Security Council at the relevant time). Nor did the new World Court ,nd much e#ective use in its early decades. e ITO never came into being (because of a loss of interest by the United States). Plans for the establishment of a permanent international criminal court were also quietly dropped. Nor did the UN Charter’s general ban against force have much apparent e#ect, beyond a cruelly ironic one: of propelling self-defence from a comparative legal backwater into the very forefront of international legal consciousness. Since self-defence was now the only clearly lawful category of unilateral use of force, the UN era became littered with self-defence claims of varying degrees of credibility, from the obvious to the risible. In particular, actions that previously would have been unashamedly presented as reprisals now tended to be deBly re-labelled as self-defence.28
All was not gloom, though, by any stretch of the imagination. In non-political spheres, lawyers fared a great deal better, very much in the technocratic spirit of nineteenth-century positivism. e codi,cation of international law, for example, made some major strides, in large part from the activity of a UN body of technical experts called the International Law Commission. e principal areas of law that received a high degree of codi,cation included the law of the sea (with four related conventions on the subject in 1958, replaced in 1982 by a single, broader convention), diplomatic and consular relations (in the early 1960s), human rights (with two international covenants in 1966), and the law of treaties (in 1969).
At the same time, though, it was not so clear that the fundamentals of the subject had changed very much. e basic positivist outlook continued to have great staying power. Some of the most important political and intellectual upheavals of the twentieth century
28 See Gray, below, Ch 21.

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stephen c neff |
leB strangely little mark on international law. Socialism, for example, far from being a major challenge to lawyers, was actually a conservative force. Socialist theorists tended to write more dogmatically in the positivist vein than their Western counterparts did, insisting with particular strength on the upholding of respect for State sovereignty (see Tunkin, 1974). Nor did the massive in.ux of developing States onto the world scene bring about any fundamental conceptual upheaval. For the most part, the developing countries readily accepted established ways, although they made some concrete contributions in speci,c areas. One was the establishment of self-determination as a fundamental, collective human right. Another was in the area of succession to treaties by newly independent States, with the States being given an option of choosing which colonial treaties to retain.
2. New challenges
Around the 1980s, a certain change of atmosphere in international law became evident, as something like the idealism of the early post-war years began, very cautiously, to return. ere were a number of signs of this. One was a sharp upturn in the judicial business of the World Court. is included a number of cases of high political pro,le, from American policy in Central America to the Tehran hostages crisis to the Yugoslavian con.icts of the 1990s.29 In the 1990s, the ITO project was revived, this time with success, in the form of the creation of the World Trade Organization (WTO), which gave a signi,cant impetus to what soon became widely, if controversially, known as ‘globalization’.30 Human rights began to assume a higher pro,le, as a result of several factors, such as the global campaign against South African apartheid and the huge increase in activity of non-governmental organizations.31 e end of the Cold War led to tangible hopes that the original vision of the UN as an e#ective collective-security agency might, at last, be realized. e expulsion of Iraq from Kuwait in 1991 lent strong support to this hope. Perhaps most remarkable of all was the rebirth of plans for an international criminal court, aBer a half-century of dormancy. A statute for a permanent International Criminal Court was draBed in 1998,
entering into force in 2002 (with the ,rst trial commencing in 2009).32
In this second round of optimism, there was less in the way of euphoria than there had been in the ,rst one, and more of a feeling that international law might be entering an age of new—and dangerous—challenge. International lawyers were now promising, or threatening, to bring international norms to bear upon States in an increasingly intrusive manner. A striking demonstration of this occurred in 1994, when the UN Security Council authorized the use of force to overthrow an unconstitutional government in Haiti. In 1999, the UN Security Council acquiesced in (although it did not actually authorize) a humanitarian intervention in Kosovo by a coalition of Western powers. It was far from clear how the world would respond to this new-found activism—in particular, whether the world would really be content to entrust its security, in perpetuity, to a Concert-of-Europe style directorate of major powers.
International legal claims were being asserted on a wide range of other fronts as well, and frequently in controversial ways and generally with results that were unwelcome to some. For example, lawyers who pressed for self-determination rights for various minority groups and indigenous peoples were accused of encouraging secession
29 See irlway, below, Ch 20.
31 See Steiner, below, Ch 26.
30 See Loibl, below, Ch 24.
32 See Cryer, below, Ch 25.

a short history of international law |
27 |
movements. Some human-rights lawyers were loudly demanding changes in the traditional practices of non-Western peoples. And newly found (or newly rejuvenated) concerns over democracy, governance, and corruption posed, potentially, a large threat to governments all over the world. Some environmental lawyers were insisting that, in the interest of protecting a fragile planet, countries should deliberately curb economic growth. (But which countries? And by how much?) Economic globalization also became intensely controversial, as the IMF’s policy of ‘surveillance’ (a somewhat ominous term to some) became increasingly detailed and intrusive, and as ‘structural adjustment’ was seen to have potentially far-reaching consequences in volatile societies. Fears were also increasingly voiced that the globalization process was bringing an increase in economic inequality.
VII. conclusion
How well these new challenges will be met remains to be seen. At the beginning of the twenty-,rst century, it is hard to see the UN ‘failing’ in the way that the League of Nations did and being completely wound up. No one foresees a reversion to the rudimentary ways of Herodotus’s silent traders. But it is not impossible to foresee nationalist or populist backlashes within various countries against what is seen to be excessive international activism and against the élitist, technocratic culture of international law and organization. If there is one lesson that the history of international law teaches, it is that the world at large—the ‘outside world’ if you will—has done far more to mould international law than vice versa. By the beginning of the twenty-,rst century, international lawyers were changing the world to a greater extent than they ever had before. But it is (or should be) sobering to think that the great forces of history—religious, economic, political, psychological, scienti,c—have never before been successfully ‘managed’ or tamed. And only a rash gambler would wager that success was now at hand. Perhaps the most interesting chapters of our history remain to be written.
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further reading
Bederman, DJ (2001), International Law in Antiquity (Cambridge: Cambridge University Press), very ably covers the ancient Near East, together with classical Greece and Rome.
De Visscher, C (1968), #eory and Reality in Public International Law, 2nd edn (Princeton: Princeton University Press), has a section at the beginning which provides an excellent survey of the history of international law, focusing on doctrine and ideas.
Ehrlich, L (1962), ‘ e Development of International Law as a Science’, 105 Recueil des Cours 173–265, provides a very good overview of the intellectual history of the ,eld.
Grewe, WG (2000), #e Epochs of International Law (Byers, M (trans.)) (Berlin: Walter de Gruyter), is a general historical survey of international law, focusing on State practice and having a generally political slant.
Guggenheim, P (1958), ‘Contributions à l’histoire des sources du droit des gens’, 94 Recueil des Cours 1–84, is very enlightening on the key debates, and rival schools of thought, concerning the sources of international law through history.
Hinsley, FH (1986), Sovereignty, 2nd edn (Cambridge: Cambridge University Press), is an excellent survey of the evolution of ideas and conceptions of sovereignty over the centuries. It is particularly strong on the medieval period.
Koskenniemi, M (2001), #e Gentle Civilizer of Nations: #e Rise and Fall of International Law 1870–1960 (Cambridge: Cambridge University Press) contains a vast wealth of information on continental European (particularly French and German) thought in the nineteenth and early twentieth centuries.
Nussbaum, A (1947), A Concise History of the Law of Nations (New York: Macmillan) is a very broad-brush general historical survey of international law, concentrating largely on doctrine.
Pagden, A (2001), Peoples and Empires: Europeans and the Rest of the World, from Antiquity to the Present (London: Phoenix Press), is a sweeping survey of the historical (including the legal) evolution of imperialism, with careful attention to legal issues.
Tasioulas, J (2007), ‘Customary Inter-
national |
Law |
and |
the |
Quest for |
Global |
Justice’, |
in |
Perreau-Saussine, |
|
A and Murphy, JB (eds), #e Nature of |
||||
Customary Law: Legal, Historical and |
||||
Philosophical Perspectives, |
(Cambridge: |
Cambridge University Press), pp 097–335 is a stimulating analysis of the historical and intellectual roots of our modern ideas of customary international law.
Tuck, R (1999), #e Rights of War and Peace: Political #ought and the International Order from Grotius to Kant (Oxford: Oxford University Press), examines international law in the seventeenth and eighteenth centuries, concentrating on the doctrines of the major thinkers rather than on State practice.
e following works trace the history of certain topics:
Dhokalia, RP (1970), #e Codi,cation of
Public International Law (Manchester:
Manchester University Press).
Frey, LS and Frey, ML (1999), #e History
of Diplomatic Immunity (Columbus, OH:
Ohio University Press).
Neff, Stephen C (1990), Friends But No
Allies: Economic Liberalism and the Law of
Nations (New York: Columbia University
Press).

a short history of international law |
31 |
———(2000), #e Rights and Duties of Neutrals: A General History (Manchester: Manchester University Press).
———(2005), War and the Law of Nations: A General History (Cambridge: Cambridge University Press).
Nijman, JE (2004), #e Concept of
International Legal Personality: An
Inquiry into the History and #eory of International Law ( e Hague: TMC Asser Press).
Ralston, JH (1929), International Arbi-
tration from Athens to Locarno (London:
Oxford University Press).