This dissertation is a multidisciplinary study combining both archaeological andpaleoecological data to examine the rise of early Formative societies in Uruguay, La Plata Basin.It is contextualized within broader anthropological concerns related to the emergence of culturalcomplexity, the significance of ritual and public architecture in intermediate-level societies, andthe role of human-environment interactions during the mid-Holocene. This investigationgenerated the first Late Quaternary paleoclimatic record, based on pollen and phytolith analyses,documenting that the mid-Holocene (ca. 6,620 to ca. 4,040 bp) was a period of environmentalflux and increased aridity. It describes the occupational history of the Los Ajos site from thecreation of a household-based community integrating a centralized communal space during thePreceramic Mound Component (ca. 4,120 – 3,000- 2,500 bp) to the Ceramic Mound Component(ca. 3,000 2,500 bp to the Contact Period), where Los Ajos acquired a strong public ritualcharacter through the formatilization and spatial segregation of its mounded architecture. Duringthe Ceramic Mound Period, the site exhibited both internal stratification (inner versus outerprecincts) and dual asymmetrical architecture in its central sector, which suggest the emergenceof incipient social differentiation. This study also marks the earliest occurrence of at least twodomesticated crops in the region: corn (Zea mays) and squash (Cucurbita spp.), showing that theearly Formative societies adopted a mixed economy shortly after 4,120 bp. Collectively, theseresults challenge the long-standing view that the La Plata Basin was a marginal area byevidencing an early and idiosyncratic emergence of social complexity never before registered inthis region of South America.

Three archaeological cases from different areas of the Andes are employed to study the rise of social and cultural complexity in varying social and economic contexts, with the intention of distinguishing certain environmental and cultural factors in each case. The purpose also is to search not only for differences but for commonalities to be used for cross-cultural comparisons and to learn more about the developmental cultural history of the societies representing these cases. / En el presente trabajo se analizan tres casos de diferentes áreas de los Andes para estudiar el incremento de la complejidad cultural en contextos sociales y económicos variados con el fin de distinguir factores definidos de carácter ambiental y cultural en cada caso. El propósito final es el de la búsqueda de diferencias, así como de las características en común que se utilizan para hacer comparaciones culturales y para aprender más acerca de la historia del desarrollo cultural de las sociedades que representan estos ejemplos.

In this paper, I discuss early complexity in the southern Lake Titicaca Basin of the Bolivian Andes. I examine a regional landscape of multi-community formations that emerged during the Late Formative Period (100 BC-AD 500). I suggest that during the Late Formative in the southern Lake Titicaca basin, the establishment of Khonkho Wankane and other disembedded centers, played an important role in the social transformations that ultimately gave rise to centralized political systems. Political activity was undoubtedly an important element of social interaction, but it was enmeshed with ritual and other activities, such as mound construction, and formed an embedded part of more encompassing, large-scale ceremonial encounters. More than they were aggrandizers, those who resided at Khonkho were social and ideological mediators. This case suggests that non-state complexity may be far more variable than most current archaeological models propose. / En este artículo se discute la complejidad temprana en la cuenca sur del lago Titicaca, en los Andes bolivianos. Se estudia un paisaje regional con formaciones de carácter multicomunal que surgieron durante el Periodo Formativo Tardío (100 a.C.-500 d.C.). Se sugiere que, en esta etapa, el establecimiento de Khonkho Wankane, junto con el de los disembedded centers, es decir, centros con poca población residente, pero a los que llegaban gente en número nutrido para la realización de ceremonias, festines u otras prácticas rituales, tuvo un papel importante en la transformación social que dio origen, por último, a los sistemas políticos centralizados. Sin duda, la actividad política fue un elemento importante de interacción social, pero estuvo involucrada con rituales y otras actividades —tales como la construcción de montículos— que constituyeron una parte primordial de los más influyentes encuentros ceremoniales a gran escala. Más que un conjunto de individuos que deseaban diferenciarse o acumular más poder que los demás (aggrandizers), aquellos que residieron en Khonkho Wankane fueron mediadores sociales e ideológicos. Este caso sugiere que la complejidad no estatal pudo ser mucho más variable de lo que diversos modelos arqueológicos proponen en la actualidad.