We examine the effect of class cleavages on terrorist activity by anarchist and leftist terrorist groups in 99 American, Asian and European countries over the 1860-1950 period. We find that higher levels of political exclusion of the poor, our main measure of class conflict, were associated with...

Can religiosity sway a society's propensity for violence against outgroups? We first introduce two state-year-level religiosity measures for several pre-Enlightenment European states with the frequencies of (i) religious language in book publications and (ii) Christian names of newborns. To...

This paper proposes three theoretical mechanisms through which polygyny may be related to social unrest. The mechanisms are related to different dimensions of grievance-inducing and, partly, greed-related inequality, which may occur in polygynous societies. These dimensions include (i) economic,...

Does U.S. military aid make the United States safer? To answer this question, we collect data on 173 countries between 1968 and 2014. Exploiting quasi-random variation in the global patterns of U.S. military aid, our paper is the first to provide causal estimates of the effect of U.S. military...

We analyze the effect of income inequality on terrorism for a sample of 114 countries between 1985 and 2012. We provide evidence, robust to various methodological changes (e.g., different dependent variables, instrumental-variable approaches), that higher levels of income inequality are...

A unique dataset is used to separately analyze the social origins of left-wing and nationalist-separatist terrorism in 17 Western European countries between 1970 and 2007. We argue that the differences in the historic roots, ultimate goals as well as their negotiability, levels of domestic and...

This contribution investigates the role of education in domestic terrorism for 133 countries between 1984 and 2007. The findings point at a nontrivial effect of education on terrorism. Lower education (primary education) tends to promote terrorism in a cluster of countries where the...

This contribution examines the role of capitalism in anti-American terrorism. Using data for 149 countries between 1970 and 2007, this contribution, contrary to expectations from capitalist peace theory, does not find that Anti-American terrorism increases with external economic liberalization...

We investigate the effect of U.S. military aid and U.S. troop deployments on anti-American terrorism, using a sample of 106 countries between 1986 and 2011. We find that greater military commitment leads to more anti-American terrorism. We study the underlying mechanisms using a mediation...

This paper proposes three theoretical mechanisms through which polygyny may be related to social unrest. The mechanisms are related to different dimensions of grievance-inducing and, partly, greed-related inequality, which may occur in polygynous societies. These dimensions include (i) economic,...