Large states have been shown to be correlated with a large number of poor developmental outcomes, including poor institutions (Olsson and Hansson 2009), conflict (Buhaug and Rød 2006; Englebert et al. 2002; Raleigh and Hegre 2009), and ethnic diversity (Green 2010a). Similarly, states with artificial borders have been shown to be correlated with boundary disputes and low GDP per capita (Alesina et al. 2010; Englebert et al. 2002).

Sub-Saharan Africa has been affected by large states and artificial borders perhaps more than any other part of the world. Indeed, while Sub-Saharan Africa and Europe both contain between 48 and 50 sovereign states each, Sub-Saharan Africa is around 2.4 times larger than Europe. Moreover, with 44% of borders drawn as straight lines, “Africa is the region most notorious for arbitrary borders” (Alesina et al. 2010:7). Scholars have thus suggested that Africa’s poor economic development and numerous conflicts have been at least partially a result of its large states and artificial borders (Alesina et al. 2010; Englebert et al. 2002).

However, there is very little scholarship explaining African state size or shape, with previous literature only focusing on the persistence of state size and borders in the post-colonial period rather than on their origins (Englebert 2009; Herbst 2000). Thus my goal here is to probe the origins of state size and shape in Africa.

That’s from this paper (pdf) by Elliot Green, an American political scientist at LSE. Here is Edwin arguing that size doesn’t matter.