“…Earlier work on the formation and breakup of sovereign states includes Friedman (1977), Buchanan and Faith (1987), Findlay (1996), Alesina andSpolaore (1997, 2003), Bolton and Roland (1997), Ellingsen (1998), Wittman (2000), Wacziarg (2000, 2005), Milanović (2001), Goyal and Staal (2003), Le Breton and Weber (2003), Spolaore (2004Spolaore ( , 2008, Haimanko, Le Breton and Weber (2005), and Spolaore and Wacziarg (2005). Examples of more recent research in this area are Michalopoulos and Papaioannou (2016), Fernández-Villaverde, Koyama, Lin and Sng (2020), Cervellati, Lazzaroni, Prarolo and Vanin (2019), Gancia, Ponzetto and Ventura (2022), Esteban, Flamand, Morelli and Rohner (2022), and Castañeda Dower, Markevich and Zhuravskaya (2022). Several of the above contributions will be covered in the rest of this paper, as part of a broader discussion of concepts and themes that characterize the economic approach to political borders (for previous discussions of this literature see, for instance, Alesina andSpolaore, 2015, andSpolaore, 2016).…”