Lowes and Nunn test the theory that the transatlantic and Indian Ocean slave trades of the thirteenth to nineteenth centuries prompted a shift towards matrilineal kinship systems throughout sub-Saharan Africa. Controlling for ecological variables commonly thought to affect kinship structure (including ruggedness of terrain, suitability for agriculture, etc.), the authors find a significant correlation between the number of people enslaved from a given ethnic group, and the tendency of that group towards a matrilineal kinship system. Polygyny was also identified as a statistically significant characteristic of communities most impacted by the slave trade.

The author analyzes conditions that might favor social resilience during the Late Antique Little Ice Age (ca. 536-556 CE). The assumption is made that climatic conditions in the Northern Hemisphere during this period of time are very similar to those that would occur during a nuclear winter. These conditions include a drop in temperature and decreased solar radiation from volcanic eruptions. Measures for social resilience come from multiple variables for social change, which are tested against measures for type of political engagement. It is argued that broad political participation is correlated with resilience.

The second and third parts of this book classify the economic systems of foraging and agricultural societies in the SCCS based on correlations between their institutions of property an distribution. These economic types are then examined for relationships with other social, political, demographic, and environmental factors in order to draw tentative conclusions regarding the origins of the Agricultural and Industrial Revolutions. The fourth part of the book uses cross-national data to examine similar associations in industrial/service economies, and is not included here.

Although research has been conducted on individual social and psychological factors on suicide rates, there has yet to be any exploration into the role of civil society participation. This article investigates whether civil society participation influences suicide rates cross-nationally. The study hypothesizes that both political and non-political participation can reduce suicide rates by providing social and psychological benefits. Using data from 2000 to 2019 across 156 countries, as well as controlling standard variables and endogeneity, they find that both political and non-political civil society participation have a negative and statistically significant effect on suicide rates. The conclusion is that engagement in civil society, whether political or non-political, may help lower suicide rates nationally.

This article presents a theory of evolutionary development of incest regulation, namely that as societal complexity increases the incest taboo will become less extensive. The author presents empirical support for this theory, though the association is not supported among simply structured societies. The role of descent type is also discussed.

Given that research on female political representation tends to be overlooked across many societies, this study investigates whether historical female political leadership influences contemporary female political representation in Africa. The authors hypothesize that precolonial traditions of women in leadership persist in shaping present-day representation. Using two original datasets—one from cross-cultural samples and one from previous elections—they find that ethnic groups with histories of female leaders have more women elected today, with results also show that many institutional factors have shaped women’s traditional political roles, and that the effects of historical colonialism have reversed much of their influence. The conclusion is that historical female leadership continues to affect modern representation, though shaped by institutional change.

From 1600 to 1900, the ratio of men to women enslaved and exported in the African slave trade was roughly 181:100 – in other words, nearly two men were enslaved for every woman. It has long been theorized that this historical disparity continues to affect Africa’s cultural and political systems. In this article, the authors examine the impact of temporary gender imbalances caused by the slave trade on female political participation in modern African nation-states. They find that female political participation (measured using national voting records from 2011–2018) is higher in parts of Africa that lost a greater number of individuals to the slave trade, but only among non-patrilineal ethnic groups.

Considerable disagreement exists in regard to the origin and distribution of economic phenomena such as money, slavery, markets, exchange, and imbalanced transfers. Here the author utilizes a worldwide cross-cultural sample of 60 pre-industrial "societies" to empirically test many economic hypotheses, with a focus on distributional mechanisms and institutions.

This study uses Bayesian phylogenetic regression modelling across 131 largely non-industrial societies to test how variation of punishment is impacted by social, economic, and political organization. The authors focus on the presence of norm violations and types of punishments, and explores their relationships. The norm violations include adultery, rape, religious violations, food violations, and war cowardice. While the types of punishment are reputational, material, physical, or education. This study suggests a hypothesis for each type of punishment in relation to socioecological variables.

This study examines pairwise differences between similar cultures in order to minimize cultural variation within the SCCS and reveal possible correlates of cultural complexity. Results suggest that one measure of complexity (government above the community level) is significantly associated with several other variables.