“…A recent, flourishing literature exploits historical data in order to understand the fundamental mechanisms underlying the spatial distribution of economic activity across countries, across regions or cities within countries, or across neighbourhoods within cities. Historical patterns of spatial development may indeed shed light on: the role of agricultural productivity on urban development (Matsuyama, 1992;Nunn and Qian, 2011); the long-term drivers of urban structure within and between cities (Ahlfeldt et al, 2015;Siodla, 2015;Redding and Sturm, 2016;Heblich et al, 2021b;Hornbeck and Keniston, 2017), and the specific role of transportation (Baum-Snow, 2007;Duranton and Turner, 2012;Brooks and Lutz, 2019;Heblich et al, 2021a); the effect of transportation on the spatial distribution of economic activity (Atack, 2013;Donaldson and Hornbeck, 2016;Donaldson, 2018;Campante and Yanagizawa-Drott, 2018;Pascali, 2017;Trew, 2020) and the role of distance and communication in sustaining economic exchanges (Bossuyt et al, 2001;Bakker et al, 2021;Juhász and Steinwender, 2018;Steinwender, 2018;Barjamovic et al, 2019); migration and how it shapes intergenerational mobility (Olivetti and Paserman, 2015;Abramitzky et al, 2012Abramitzky et al, , 2021bAger et al, 2019).…”