Geographic axes and the persistence of cultural diversity.

Jared Diamond's Guns, Germs, and Steel [Diamond J, (1997) Guns, Germs, and Steel (WW Norton, NY)] has provided a scientific foundation for answering basic questions, such as why Eurasians colonized the global South and not the other way around, and why there is so much variance in economic development across the globe. Diamond's explanatory variables are: (i) the susceptibility of local wild plants to be developed for self-sufficient agriculture; (ii) the domesticability of large wild animals for food, transport, and agricultural production; and (iii) the relative lengths of the axes of continents with implications for the spread of human populations and technologies. This third "continental axis" thesis is the most difficult of Diamond's several explanatory factors to test, given that the number of continents are too few for statistical analysis. This article provides a test of one observable implication of this thesis, namely that linguistic diversity should be more persistent to the degree that a geographic area is oriented more north-south than east-west. Using both modern states and artificial geographic entities as the units of analysis, the results provide significant confirmation of the relationship between geographic orientation and cultural homogenization. Beyond providing empirical support for one observable implication of the continental axis theory, these results have important implications for understanding the roots of cultural diversity, which is an important determinant of economic growth, public goods provision, local violence, and social trust.

Why (some) immigrants resist assimilation: US racism and the African immigrant experience.

Scholarship shows that Black immigrants to the US resist assimilation to reduce exposure to racial discrimination faced by native-born African Americans. But, not all Black immigrants are equally likely to be (mis)perceived as African American. We argue that immigrants who are likely to be misidentified as African American have incentives to reify ethnic boundaries as a form of protection against racial discrimination. We develop this argument from interviews and focus groups with African immigrants. We then use a lab experiment to measure rates of miscategorization and identify its correlates among African immigrants. Finally, we test our argument with a novel survey of Somalis, an immigrant population with two ethnic subgroups who differ in their likelihood of being miscategorized as African Americans. We show that this difference shapes the degree of resistance to assimilation. These findings improve our understanding of the relationship between racial discrimination and incentives for Black immigrants to resist assimilation.