“…Scholars since the late 1990s have established a cottage industry to study the determinants, effects, and meaning of naturalisation. In particular, the past two decades have seen a boom of policy indices that have made the categorization and comparison of citizenship easier than ever (see GLOBALCIT, 2017;van der Baaren & Vink, 2021;Goodman, 2015;Howard, 2009;Janoski, 2010;Palop-García & Pedroza, 2019;Schmid, 2020), including those that make connections between integration polices and access to citizenship (Ruedin, 2015) not only in Europe but in other regions of the world as well (Solano & Huddleston, 2021;Palop-García & Pedroza, 2021;Acosta 2018). Thus, there is now a significant literature on the empirics at the citizenshipintegration nexus, focusing on outcomes including economic (Džankic, 2019;Peters et al, 2018;Hainmueller et al, 2019) and political integration (Hainmueller et al, 2015;Just & Anderson, 2012).…”