This chapter tests two ways of overcoming uncertainty about relationality – having potential collaborators directly communicate how they will relate to each other, and using third parties such as matchmakers and boundary spanners. Both are useful for creating valuable new collaborative relationships, especially between people who begin as strangers. In addition, this chapter also presents evidence showing the impact of new collaborative relationships on strategic decision-making. Data in this chapter come from a variety of national surveys, field experiments, and case comparisons.

Certain poetic practices in Mexico which have traditionally received less attention from scholars have recently regained currency, and even urgency in poetic critique. This chapter explores the openly political and popular underside of twentieth-century Mexican poetry, starting with the Estridentismo movement and moving on to works by José Emilio Pacheco, Eduardo Lizalde, Renato Leduc, Efraín Huerta, Rosario Castellanos, Jaime Sabines, Francisco Hernández, Jaime Reyes, and Ricardo Castillo, among others, as well as the political poetry recently reprinted in the twenty volumes of the Archivo negro de la poesía mexicana. The chapter also examines two significant but historically silenced trends: poetry written by women and literature in Indigenous languages.

Since cultivation was late and marginal and there were no domestic animals (except the dog) in the Pampas and Patagonia, indigenous people in both regions depended almost exclusively on wild animals, both terrestrial and aquatic, and undomesticated plants. At the same time, stones were also crucial for making the tools to kill and butcher the prey and to process the plant products. As we will show, bone technology was secondary in most of the Pampas and significant only among coastal, both maritime and riverine, and Paraná Delta people. Therefore, wild natural resources were the key elements for human subsistence in the Pampas and Patagonian and, in some way, shaped their adaptive patterns.

The chapters presented before showed diverse historical trajectories, different adaptive patterns, and continuous human occupation of the Pampas and Patagonia since the end of the Pleistocene. Both regions were probably among the last continental lands, except Antarctica, colonized by Homo sapiens after their dispersal from Africa. The first outcome of this review of the archaeology of the Pampas and Patagonia is that it does not support a pre-15,000 cal BP human occupation of the Southern Cone. Putting this in the global discussion means that the Pampas-Patagonia peopling holds up a pre-13,000 cal BP (the so-called pre-Clovis Model) but post–Late Glacial Maximum human arrival at the continent, which is in agreement with current archaeological, ancient DNA, and paleoclimatic models (Llamas et al. 2016; Pitblado 2011; Posth et al. 2018; Prates et al. 2020; Sutter 2021; Waters and Stafford 2013). Moreover, most of the paleoclimatic evidence supports the hypothesis that the earliest human arrivals at the Pampas and Patagonia took place under cold climatic conditions in semiarid to arid environments (Borrero and Martin 2018; Prado et al. 2021) during the cooling period known as the Antarctic Cold Reversal (14,700–13,000 cal BP).

In this chapter, the historical background of the archaeology in the Pampas and Patagonia is discussed and summarized. It encompasses a period of about 100 years, between the 1870s when the first archaeological investigations took place in the Pampas and Patagonia (Ameghino 1880–1881; Holmberg 1884; Moreno 1874; Moseley 1892; Zeballos and Pico 1878) and the late 1970s when there was a theoretical and methodological shift in the archaeology of both regions, which gave rise to modern research. The current regional models in the Pampas and Patagonia are a product of this last period’s research, first with a processual orientation and then adding other theoretical approaches (evolutionary, processual-plus/neo-processualism, post-processualism, etc.). However, some of the data and ideas generated in this first 100 years of investigation are still present in contemporary debates, as shown in the following chapters of this book.

The Middle Holocene was a time of change in both the Pampas and Patagonia. In some way, these changes were the prelude to the demographic expansion, regional diversification, economic intensification, and social complexity that characterized the following period, the Late Holocene. During the Middle Holocene times, archaeological evidence in the Pampas was scarce until a decade ago or so, but recent research increased information significantly (e.g., Ávila 2011; Ávila et al. 2011; Bonomo et al. 2013; Donadei Corada 2020; Gutiérrez et al. 2010; Mazzanti et al. 2015; Messineo et al. 2019a, b, c; Politis et al. 2012; Scheifler 2019). This period is characterized by global warming, known as the Hypsitermal or Holocene Thermal Maximum (Renssen et al. 2012). As a result, in the Pampas, the sea level raised above the current level at around 7000 BP. However, there is no agreement about the magnitude of this raising (between 2.2 to 6 masl depending on the author) and the chronology of the maximum ingression (see revisions in Aguirre and Whatley 1995; Melo et al. 2003). For Isla and Espinosa (1995), it began at the onset of the Holocene, reaching its maximum height (around 2 masl) around 6500–6000 BP. This resulted in the coast having sometimes a transgressive position, such as in the east of the Salado Depression and the Paraná Delta (Cavallotto et al. 2004, 2005; Iriondo and Kröhling 2008), while in other cases, it was very close to the present according to the variations of the littoral morphology.

During the Late Holocene time, regional differentiation, which became visible during the Middle Holocene, produced a wide variety of historical trajectories and adaptive patterns in the Pampas and Patagonia. It is clear that around 4000 BP human populations were selectively using all the diverse, available habitats. In this period, the archaeological visibility increased significantly, a fact that also suggests a rise in the population density of both regions (see discussion in Chapter 7).

This book summarizes the current archaeological and ethnographic knowledge regarding the indigenous people who inhabited the South American Southern Cone since the end of the Pleistocene (Figure 1.1). This land, roughly between 32° and 56° S latitude, comprises the Pampas and Patagonia. Since the beginning of the European conquest in the sixteenth century, both regions have attracted the attention of conquerors and explorers even though there were no precious rocks or metals within them, nor were they inhabited by indigenous populations who could be easily exploited or subjugated to slavery or encomiendas. This is not to say that there were no fabulations – notably, the legend of the Ciudad de Los Césares, or Trapalanda, where supposedly fabulous riches could be found. This legend originated around the sixteenth century when stories after the inland trip by Francisco César, a captain from the Sebastian Gaboto expedition, began to circulate. Also, the castaways from the shipwreck of one of Francisco Camargo’s expeditions fueled these legends. The sad reality was that no evidence existed about the fate of those castaways.

As we show in Chapter 2, there has been a long tradition of the archaeological research in both the Pampas and Patagonia since the end of the nineteenth century. From the very beginning of the investigations, the Late Pleistocene human occupation was at the top of the research agenda in both regions. Giant ground sloth skins from Cueva del Milodón and human skulls supposedly found in very ancient (Tertiary) layers in the Pampas seashore ignited the imagination of scientists of those times, and fieldwork looking for spectacular findings as well as reckless interpretations abounded. Since then, the first human occupation has been the main focus of the archaeological investigation in both regions. This chapter summarizes and discusses the results of this almost continuous, intense, and fertile archaeological research.