“…This has long been recognised by political geographers, who argue that space and scale are not natural, but socially and politically constructed, and the outcome of power struggles between competing social forces (Massey, 1992;Agnew, 1994;Cox, 1998;Gough, 2004). This 'politics of scale' framework has been recently used to examine region building by the 'Pink Tide' of leftist governments in Latin America, examining the ways in which transnational social forces operating across regional organizations have sought to construct a 'counterhegemonic' regionalism to challenge the neoliberal world order (Muhr, 2013(Muhr, , 2017(Muhr, , 2019(Muhr, , 2016Spalding, 2015;Perrotta, 2016). This article builds on these analyses to account for the evolving nature of Mercosur, highlighting how its different phases reflected the political projects of competing coalitions of social forces, and how the politics of scale associated with attempts to lock in governance at the regional level led to Mercosur's politicization.…”