This essay reviews the work of the Institut de Droit International, for the occasion of the 150th anniversary of its founding in 1873, that addresses the acquisition or status of territory during the epochs of imperialism, sacred trust of civilization, and territorial administration by or under the United Nations. Section A of this essay introduces the work in a summary fashion. Section B briefly describes the context for each epoch. Section C highlights the challenges and controversies in each epoch surrounding the related topics studied by the Institute. Section D analyzes the three resultant resolutions. Section E briefly comments on the impact of the work, and Section F concludes by taking a look into the future. By and large, the work of the Institute relating to acquisition or status of territory stays very close to the leitmotifs or practices of the different epochs, although one can glean glimpses of inching forward on the part of the Institute, or more so of certain members. Notable examples are its assessment that notice of occupation is required to make it effective and may be done in the normal way of giving publicity to official acts or through the diplomatic channel, and its view on the international mandates system that, “The communities under mandate are subjects of international law. They have a patrimony distinct from that of the mandatory State; they possess a national status, and they may acquire rights or be held to their obligations.” The Institute’s work can be considered solid “codification” efforts. As such, the work, just like any other private codification efforts, may conceivably contribute to the strengthening of the relevant practice, for good or ill, or for good and ill, as we can see that such practice in the past, together with the codification that aspired to reflect it, can never catch up with the future.

中文翻译：

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国际法学会工作的领土

本文回顾了国际法学会在其 1873 年成立 150 周年之际所做的工作，该工作涉及帝国主义时代的领土获取或地位、文明的神圣信托以及由或在其统治下的领土管理联合国。本文的 A 节以总结的方式介绍了这项工作。B 节简要描述了每个 epoch 的上下文。C 部分重点介绍了每个时代围绕研究所研究的相关主题的挑战和争议。D 部分分析了三个最终的解决方案。E 部分简要评论了这项工作的影响，F 部分最后展望了未来。总的来说，研究所关于领土获取或地位的工作与不同时代的主题或实践非常接近，尽管我们可以瞥见研究所或某些成员的进展。值得注意的例子是它评估占领通知需要使其生效，并且可以以宣传官方行为的正常方式或通过外交渠道进行，以及它对国际任务制度的看法，即“受管辖的社区是国际法的主体。他们拥有不同于强制国家的遗产；他们拥有国家地位，他们可能获得权利或承担义务。” 研究所的工作可以被认为是扎实的“编纂”工作。因此，这项工作，