Coalescence is a distinctive process of village aggregation that creates larger, socially cohesive communities from smaller, scattered villages. This dissertation asks: how do individual and collective social relationships change throughout the process of coalescence, and how might these relationships contribute to the social cohesiveness of a coalescent community?

Coalescent communities share characteristics that reveal the relationship between collective action and collective identities in their social dynamics. Collective identity is a shared sense of oneness among members of a group. It can be understood as the product of two processes: categorical and relational identification. Categorical identification is a shared association with a specific category, such as an ethnic group or a religious association. Relational identification is the product of direct, interpersonal interaction. The potential for a group to engage in collective action is linked to the intensity (prominence as compared to other aspects of identity) and scale (social unit and size of group) of categorical and relational identification.

Patterns in the intensity and scale of categorical and relational identification are used to trace changing social dynamics through the process of community coalescence. The case study is a sequence of four sites that were successively occupied by the same Ancestral Wendat (Iroquoian) community over a period of 150 years in south-central Ontario. The intensity of categorical identification is assessed by measuring the consistency of decorative styles among pottery vessels. The intensity of relational identification is assessed by measuring production variability among ceramic pots and pipes using microscopic characterization.

The analyses reveal a correlation between the intensity and scale of categorical and relational identification and village-scale social cohesion and collective action. Village-scale categorical identification was less intensive during the period of initial aggregation, with a subsequent increase in intensity observed at fully coalesced sites where evidence of social cohesion and village-scale collective action is present. As coalescence progressed, the intensity of relational identification at the village scale decreased. This evidence suggests that changing dynamics of categorical and relational ties among community members were intertwined with the development of social cohesion and the increased potential for village-scale collective action at the culmination of coalescence.