The commencement of hostilities in Europe in late summer 1914 transformed the southern Atlantic cities of Buenos Aires and Rosario into diasporic home fronts for many belligerent nations. These cities became at once contested terrains between and among émigré colonies and a source of financial and material aid for warring nations. Buenos Aires’ policy of neutrality further permitted activist immigrants to partner with like-minded individuals and their respective diplomatic representatives to organise civic associations, arrange public demonstrations, and host charity events. The Syrian-Ottoman colonies mirrored the efforts of other immigrant groups, but diverged in distinct ways as novel nationalist sentiments circulated among them. The increased social tension from penury and competing political agendas led to multiple violent confrontations among Syrian Ottomans. Thus, nations that did not directly fight in the European conflagration were indeed party to the First World War and warring states’ home fronts extended beyond national boundaries.