Writing studies scholarship has long understood the need for context-based studies of student writing. Few studies, however, have closely examined how students use intertextual relationships in the context of learning to compose argumentative essays. Drawing on a 17-day argumentative writing unit in a ninth-grade humanities classroom, this article uses the concept of "intertextual trace" to explore how students make intertextual connections in their writing and negotiate the social dynamics of classroom learning. Intertextual analysis of students' final essays revealed overlapping tracings and resonances across multiple resources, showing how and the ways in which students create arguments and respond to exigencies within a classroom setting. Analysis of thematic, structural, and lexical tracings also showed students making intertextual connections through repeating, reordering, responding to, and extending the texts offered by their teacher and peers. In so doing, students served as curators--shaping ideas, curricular offerings, and language into final argumentative essays--who were able to develop agency in and through their writing.