In this article, I analyse the production and reception of a 1923 social monograph on migrant communities in New England and in doing so: (1) outline an archaeology of the social sciences in the U.S., by analysing aspects of their development, dynamics, institutional politics and research agendas; (2) discuss the tensions between social, racial and cultural interpretations of inequalities in the political economy of the 1920s; (3) analyse the pervasiveness of racialist thinking in science, society and politics, its impact in the hierarchization of groups for purposes of border control, and how the targeted groups responded to it.