This essay engages with Daniel Laqua's book Activism across Borders since 1870: Causes, Campaigns and Conflicts in and beyond Europe (London, 2023) from the perspective of a historian of both humanitarianism and youth. This short reflection therefore focuses primarily on the book's engagement with the topic of humanitarianism, before discussing an understated, albeit important, cross-cutting theme of the book: the significance of youth in transnational activism. It highlights a number of features of Laqua's book, for instance the merits of adopting a broad chronological approach. At the same time, the essay also uses the space to present a number of reflections on activism, from questions about the generational appeal of particular causes to the way in which particular figures might spark activism. It ends with some thoughts about the source base used to write such histories of activism.

中文翻译：

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跨越时空的人道主义和青年行动

本文与 Daniel Laqua 的书相关1870 年以来的跨境行动主义：欧洲内外的原因、运动和冲突（伦敦，2023）从人道主义和青年历史学家的角度来看。因此，这篇简短的反思主要集中在本书与人道主义主题的接触上，然后讨论本书中一个低调但重要的跨领域主题：青年在跨国行动中的重要性。它强调了拉夸这本书的许多特点，例如采用广泛的时间顺序方法的优点。与此同时，本文还利用这个空间提出了对激进主义的一些反思，从有关特定事业的代际吸引力的问题到特定人物可能激发激进主义的方式。最后对用于撰写此类激进主义历史的来源基础进行了一些思考。