The volume considers how processes of political centralization, hierarchy building, and social differentiation were related in the political histories of ancient Southeast Mesoamerican societies. We define the above terms here and review how proponents of world systems, prestige goods, and community of practice theories have understood these connections. Subsequently, we summarize our approach to the topic. This perspective models political formations as the variably successful, never fully stable, outcomes of efforts made by agents of different ranks and identities to secure power by drawing on resources obtained through social networks of differing spatial extents. The resulting social webs were thus means for promoting cooperation among agents who were allied in the pursuit of shared goals even as they competed with those seeking comparable objectives through different social connections.