This chapter examines the social and political history of the construction of the most significant physical monuments produced in the Mexican mission: a network of 251 monasteries, which I refer to as doctrina monasteries.While scholars have examined these structures in terms of architectural and art history, the social history of these monasteries remains neglected. I argue that these monumental building campaigns formed part of indigenous efforts to reconstitute communities in the wake of the severe disruptions caused by the hueycocolixtli epidemic of 1545-1547.Remarkably, in the decade after losing a third of their population, the number of indigenous communities that decided to build large monasteries more than doubled, from 43 to 119 large-scale projects.For indigenous rulers, monastery construction served as a highly visible means of reasserting political power.As a replacement for the teocalli (Mesoamerican temple), the doctrina monastery came to represent the sovereignty of the local native state.Moreover, the process of producing the monastery employed indigenous mechanisms of tribute and obligatory labor that reinforced rulers’ claims over outlying territories and peoples. Nonetheless, labor and tribute were not automatic mechanisms.Instead, the mobilization of labor and tributes were governed by expectations of reciprocity that bound rulers to commoners.Archival evidence reveals the frailty of such arrangements. As ongoing demographic crises strained the social contract, resistance to building campaigns intensified.Thus, these colossal structures embodied aspirations that ultimately were far more fragile than the stone and mortar of these structures’ hulking walls.